How humans contribute to climate change?
🇺🇳According to the UN, today burning of fossil fuels by humans is the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions.
CO2 is the primary greenhouse gas emitted through human activities.
Human activities are altering the carbon cycle–both by adding more CO2 to the atmosphere and by influencing the ability of natural sinks (forests, soils...) to remove and store CO2 from the atmosphere.
While CO2 emissions come from a variety of natural sources, human-related emissions are responsible for the increase that has occurred in the atmosphere since the industrial revolution that began around 1750.
💡🏭✈️🚇🚘The main human activity that emits CO2 is the combustion of fossil fuels for energy, transportation and industry.
ℹ️According to researchers, CO2 levels are now higher than at anytime in the past 3.6 million years.
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🇺🇳According to the UN, today burning of fossil fuels by humans is the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions.
CO2 is the primary greenhouse gas emitted through human activities.
Human activities are altering the carbon cycle–both by adding more CO2 to the atmosphere and by influencing the ability of natural sinks (forests, soils...) to remove and store CO2 from the atmosphere.
While CO2 emissions come from a variety of natural sources, human-related emissions are responsible for the increase that has occurred in the atmosphere since the industrial revolution that began around 1750.
💡🏭✈️🚇🚘The main human activity that emits CO2 is the combustion of fossil fuels for energy, transportation and industry.
ℹ️According to researchers, CO2 levels are now higher than at anytime in the past 3.6 million years.
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How global human-related CO2 emissions are calculated?
📊Global human-related CO2 emissions are calculated in GtCO2 (one billion tonnes of CO2) per year.
➕✖️🟰Countries report their emissions through what is known as a ‘bottom up’ approach, where national emissions are estimated by combining data on types of activity with the emissions typically produced by those activities. So, if you know how much CO2 steelmaking produces, and you know how much steel is produced in a country, you can estimate the total quantity of emissions from the steel sector. There are internationally agreed guidelines that specify how this kind of accountancy should be done.
ℹ️According to researchers, in 2022, global CO2 emissions from fossil fuel combustion and cement production reached 36.1 ± 0.7 GtCO2. In the sectoral breakdown of 2022 CO2 emissions power accounted for 39.3%, industry 28.9%, ground transportation 17.9%, residential 9.9%, international bunkers 3.1%, and domestic aviation 0.9%.
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📊Global human-related CO2 emissions are calculated in GtCO2 (one billion tonnes of CO2) per year.
➕✖️🟰Countries report their emissions through what is known as a ‘bottom up’ approach, where national emissions are estimated by combining data on types of activity with the emissions typically produced by those activities. So, if you know how much CO2 steelmaking produces, and you know how much steel is produced in a country, you can estimate the total quantity of emissions from the steel sector. There are internationally agreed guidelines that specify how this kind of accountancy should be done.
ℹ️According to researchers, in 2022, global CO2 emissions from fossil fuel combustion and cement production reached 36.1 ± 0.7 GtCO2. In the sectoral breakdown of 2022 CO2 emissions power accounted for 39.3%, industry 28.9%, ground transportation 17.9%, residential 9.9%, international bunkers 3.1%, and domestic aviation 0.9%.
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What is the link between climate crisis and meat/dairy products?
The link between climate crisis and meat/dairy products may not be obvious, but for many experts it’s clear.
🥩🥛↔️🌏🌦
Studies affirm that between 11.1 and 19.6% of global human-made greenhouse gas (GHG) emissions come from meat and dairy production/animal agriculture, which is a leading cause of deforestation, responsible for significant biodiversity loss and pollution, and emits large amounts of methane, which alone is the cause of over 25% of global warming.
📌Some experts even claim that animal agriculture is the largest contributor to global climate change.
📌However, according researchers, the extent to which it contributes to global emissions depends on how studies define different economic sectors, and whether they incorporate farming equipment and food exports in the assessment of animal impact.
ℹ️Most sources list animal agriculture as the No. 2 contributor to GHG emissions after fossil fuels.
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The link between climate crisis and meat/dairy products may not be obvious, but for many experts it’s clear.
🥩🥛↔️🌏🌦
Studies affirm that between 11.1 and 19.6% of global human-made greenhouse gas (GHG) emissions come from meat and dairy production/animal agriculture, which is a leading cause of deforestation, responsible for significant biodiversity loss and pollution, and emits large amounts of methane, which alone is the cause of over 25% of global warming.
📌Some experts even claim that animal agriculture is the largest contributor to global climate change.
📌However, according researchers, the extent to which it contributes to global emissions depends on how studies define different economic sectors, and whether they incorporate farming equipment and food exports in the assessment of animal impact.
ℹ️Most sources list animal agriculture as the No. 2 contributor to GHG emissions after fossil fuels.
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Which countries and regions emit the most CO2?
🇺🇸 The USA is the biggest emitter in history, having released more than 420 GtCO2 into the atmosphere - a quarter of all historical human-related CO2.
In 2022, 3 countries account for the lion’s share of global CO2 emissions.
🇨🇳China is highest, at 32%-11.5 GtCO2.
🇺🇸The USA is next with 14%-5 GtCO2.
🇮🇳India's emissions make up 8%-2.8 GtCO2.
🇪🇺The European Union accounts for 8%-2.8 GtCO2.
🇷🇺🇯🇵🇮🇷🇸🇦🇮🇩🇨🇦
The top 10 countries with highest CO2 emissions include Russia, Japan, Iran, Saudi Arabia, Indonesia and Canada.
In 2022
✔️with 17.7 GtCO2, the Asia-Pacific region is the largest emitter. However, as it is home to more than 60% of the world’s population per capita emissions are there slightly lower than the world average.
✔️the 2nd most polluting region is North America - 5.9 GtCO2.
✔️Africa and South America are both fairly small emitters: accounting for 3-4% (1.4 GtCO2) of global emissions each.
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🇺🇸 The USA is the biggest emitter in history, having released more than 420 GtCO2 into the atmosphere - a quarter of all historical human-related CO2.
In 2022, 3 countries account for the lion’s share of global CO2 emissions.
🇨🇳China is highest, at 32%-11.5 GtCO2.
🇺🇸The USA is next with 14%-5 GtCO2.
🇮🇳India's emissions make up 8%-2.8 GtCO2.
🇪🇺The European Union accounts for 8%-2.8 GtCO2.
🇷🇺🇯🇵🇮🇷🇸🇦🇮🇩🇨🇦
The top 10 countries with highest CO2 emissions include Russia, Japan, Iran, Saudi Arabia, Indonesia and Canada.
In 2022
✔️with 17.7 GtCO2, the Asia-Pacific region is the largest emitter. However, as it is home to more than 60% of the world’s population per capita emissions are there slightly lower than the world average.
✔️the 2nd most polluting region is North America - 5.9 GtCO2.
✔️Africa and South America are both fairly small emitters: accounting for 3-4% (1.4 GtCO2) of global emissions each.
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How do CO2 emissions in North and South America look like from space?
Advanced computer modeling techniques allow to make visualizations showing the CO2 being added to Earth's atmosphere over the course of the year 2021, split into four major contributors: fossil fuels in orange, burning biomass in red, land ecosystems in green, and the ocean in blue. The dots on the surface also show how atmospheric CO2 is also being absorbed by land ecosystems in green and the ocean in blue.
🌎In this view ⬆️ highlighting North and South America, during the growing season plants absorb CO2 through photosynthesis, but release much of this carbon through respiration during winter months. One can see fossil fuel emissions from the northeastern urban corridor in the United States. The fast oscillation over the Amazon rainforest shows the impact of plants absorbing carbon while the sun is shining and then releasing it during nighttime hours.
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Advanced computer modeling techniques allow to make visualizations showing the CO2 being added to Earth's atmosphere over the course of the year 2021, split into four major contributors: fossil fuels in orange, burning biomass in red, land ecosystems in green, and the ocean in blue. The dots on the surface also show how atmospheric CO2 is also being absorbed by land ecosystems in green and the ocean in blue.
🌎In this view ⬆️ highlighting North and South America, during the growing season plants absorb CO2 through photosynthesis, but release much of this carbon through respiration during winter months. One can see fossil fuel emissions from the northeastern urban corridor in the United States. The fast oscillation over the Amazon rainforest shows the impact of plants absorbing carbon while the sun is shining and then releasing it during nighttime hours.
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How do CO2 emissions in Africa, Asia, Australia and Europe look like from space?
🌏The left view ⬆️ highlights CO2 sources and sinks over Asia and Australia. The notable feature is fossil fuel emissions from China. In contrast, drawdown from the land biosphere is visible over Australia for much of the year because emissions and population density are much lower. By the end of the animation, fossil fuel emissions which are released predominantly in the Northern Hemisphere are mixing southward obscuring Australia.
🌍The right view ⬆️ highlights Europe, the Middle East, and Africa. European fossil fuel emissions are visible as is red representing emissions from fires over central Africa that are used to clear crop residue.
ℹ️ Fires represent a much smaller source of CO2 to the atmosphere than fossil fuel emissions, but are monitored by scientists as they can alter the ability of an ecosystem to sequester carbon and in the future become more severe because of climate change.
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🌏The left view ⬆️ highlights CO2 sources and sinks over Asia and Australia. The notable feature is fossil fuel emissions from China. In contrast, drawdown from the land biosphere is visible over Australia for much of the year because emissions and population density are much lower. By the end of the animation, fossil fuel emissions which are released predominantly in the Northern Hemisphere are mixing southward obscuring Australia.
🌍The right view ⬆️ highlights Europe, the Middle East, and Africa. European fossil fuel emissions are visible as is red representing emissions from fires over central Africa that are used to clear crop residue.
ℹ️ Fires represent a much smaller source of CO2 to the atmosphere than fossil fuel emissions, but are monitored by scientists as they can alter the ability of an ecosystem to sequester carbon and in the future become more severe because of climate change.
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What is the “command centre” of most animals?
📌The nervous system (NS) is the “command centre” of an animal's body that coordinates its behavior and transmits signals between different body areas.
📌The function of the NS is to control movement of the organism and to affect the environment (e.g. through pheromones) by sending signals from one cell to others, or from one part of the body to others.
📌At the cellular level, the NS is defined by the presence of neurons, also known as "nerve cells".
📌Nervous systems are found in almost all multicellular animals, but vary greatly in complexity.
📌The NS derives its name from nerves, which are cylindrical bundles of fibers that emanate from the brain and central cord, and branch repeatedly to innervate every part of the body. Nerves are large enough to have been recognized by the ancient Egyptians, Greeks, and Romans, but their internal structure was not understood until it became possible to examine them using a microscope.
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📌The nervous system (NS) is the “command centre” of an animal's body that coordinates its behavior and transmits signals between different body areas.
📌The function of the NS is to control movement of the organism and to affect the environment (e.g. through pheromones) by sending signals from one cell to others, or from one part of the body to others.
📌At the cellular level, the NS is defined by the presence of neurons, also known as "nerve cells".
📌Nervous systems are found in almost all multicellular animals, but vary greatly in complexity.
📌The NS derives its name from nerves, which are cylindrical bundles of fibers that emanate from the brain and central cord, and branch repeatedly to innervate every part of the body. Nerves are large enough to have been recognized by the ancient Egyptians, Greeks, and Romans, but their internal structure was not understood until it became possible to examine them using a microscope.
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What do we know about neurons?
✔️One of the two main types of cells in the nervous system are neurons.
🔬✍️They can be distinguished from other cells in a number of ways, but their most fundamental property is that they communicate with other cells via synapses, which are junctions containing molecular machinery allowing rapid transmission of electrical or chemical signals.
🔬✍️Many types of neuron possess an axon, a protoplasmic protrusion that can extend to distant parts of the body and make thousands of synaptic contacts.
✍️Even in the nervous system of a single species, hundreds of different types of neurons exist, with various morphologies and functions. For example, sensory neurons transmute physical stimuli such as light and sound into neural signals, and motor neurons transmute neural signals into activation of muscles or glands. In many species, though, the majority of neurons receive all of their input from other neurons and send their output to other neurons.
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✔️One of the two main types of cells in the nervous system are neurons.
🔬✍️They can be distinguished from other cells in a number of ways, but their most fundamental property is that they communicate with other cells via synapses, which are junctions containing molecular machinery allowing rapid transmission of electrical or chemical signals.
🔬✍️Many types of neuron possess an axon, a protoplasmic protrusion that can extend to distant parts of the body and make thousands of synaptic contacts.
✍️Even in the nervous system of a single species, hundreds of different types of neurons exist, with various morphologies and functions. For example, sensory neurons transmute physical stimuli such as light and sound into neural signals, and motor neurons transmute neural signals into activation of muscles or glands. In many species, though, the majority of neurons receive all of their input from other neurons and send their output to other neurons.
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What are glial cells?
✔️The second main type in the nervous system are glial cells.
Glial cells (named from the Greek word for "glue") are non-neuronal cells that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system.
Among the most important functions of glial cells are:
📍to support neurons and hold them in place
📍to supply nutrients to neurons
📍to insulate neurons electrically
📍to destroy pathogens and remove dead neurons
📍to provide guidance cues directing the axons of neurons to their targets.
✍️A very important set of glial cell generate layers of a fatty substance called myelin that wrap around axons and provide electrical insulation that allows them to transmit signals much more rapidly and efficiently.
✍️🧠In the human brain, it is currently estimated that the total number of glia roughly equals the number of neurons, although the proportions vary in different brain areas.
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✔️The second main type in the nervous system are glial cells.
Glial cells (named from the Greek word for "glue") are non-neuronal cells that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system.
Among the most important functions of glial cells are:
📍to support neurons and hold them in place
📍to supply nutrients to neurons
📍to insulate neurons electrically
📍to destroy pathogens and remove dead neurons
📍to provide guidance cues directing the axons of neurons to their targets.
✍️A very important set of glial cell generate layers of a fatty substance called myelin that wrap around axons and provide electrical insulation that allows them to transmit signals much more rapidly and efficiently.
✍️🧠In the human brain, it is currently estimated that the total number of glia roughly equals the number of neurons, although the proportions vary in different brain areas.
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What are the components of the nervous system?
✍️The nervous system of vertebrates has two components: the central nervous system (CNS) and the peripheral nervous system (PNS).
☑️The CNS is the largest part, and includes the brain and the spinal cord.
☑️Structures that do not lie within the CNS, are called the PNS.
The majority of nerves belong to the PNS, even when the cell bodies of the neurons to which they belong reside within the brain or spinal cord.
The PNS is divided into:
🔘the somatic part consisting of the nerves that innervate the skin, joints, and muscles.
🔘the visceral part, or the autonomic nervous system, that contains neurons that innervate the internal organs, blood vessels, and glands, and itself has two parts:
▪️the sympathetic nervous system
and
▪️the parasympathetic nervous system.
ℹ️Some authors also include sensory neurons whose cell bodies lie in the periphery (for senses such as hearing) as part of the PNS; others, however, omit them.
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✍️The nervous system of vertebrates has two components: the central nervous system (CNS) and the peripheral nervous system (PNS).
☑️The CNS is the largest part, and includes the brain and the spinal cord.
☑️Structures that do not lie within the CNS, are called the PNS.
The majority of nerves belong to the PNS, even when the cell bodies of the neurons to which they belong reside within the brain or spinal cord.
The PNS is divided into:
🔘the somatic part consisting of the nerves that innervate the skin, joints, and muscles.
🔘the visceral part, or the autonomic nervous system, that contains neurons that innervate the internal organs, blood vessels, and glands, and itself has two parts:
▪️the sympathetic nervous system
and
▪️the parasympathetic nervous system.
ℹ️Some authors also include sensory neurons whose cell bodies lie in the periphery (for senses such as hearing) as part of the PNS; others, however, omit them.
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What are some amazing facts about the animals’ nervous system?
ℹ️Sponges are the only multicellular animals without a nervous system.
🪱🐘The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in elephants ⬆️.
🔰 The minuscule C. elegans nematode worm has just 302 neurons, but it’s able to carry out the same functions as the nervous systems of higher organisms.
🔰 The tiny Megaphragma mymaripenne wasp ⬆️ only lives for 5️⃣ days and has just 7️⃣4️⃣0️⃣0️⃣ neurons. As it changes from a larva into an adult, it destroys the majority or its neural nuclei until just a few hundred are left, because there’s not enough room in its head.
🔰 At a larval stage, sea squirts have the same anatomical characteristics as most vertebrates, but as they grow, they lose their minds – literally. They digest their own cerebral ganglia, which controls movement, because once they’re sedentary, they no longer need it.
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ℹ️Sponges are the only multicellular animals without a nervous system.
🪱🐘The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in elephants ⬆️.
🔰 The minuscule C. elegans nematode worm has just 302 neurons, but it’s able to carry out the same functions as the nervous systems of higher organisms.
🔰 The tiny Megaphragma mymaripenne wasp ⬆️ only lives for 5️⃣ days and has just 7️⃣4️⃣0️⃣0️⃣ neurons. As it changes from a larva into an adult, it destroys the majority or its neural nuclei until just a few hundred are left, because there’s not enough room in its head.
🔰 At a larval stage, sea squirts have the same anatomical characteristics as most vertebrates, but as they grow, they lose their minds – literally. They digest their own cerebral ganglia, which controls movement, because once they’re sedentary, they no longer need it.
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What are some interesting features of the human nervous system?
🔴 The human nervous system can transmit signals at speeds of 100 meters per second.
🔴 The slowest signal transmission occurs inside the skin.
🔴 Every square cm of human skin contains around 200 pain receptors but only 15 receptors for pressure, 6 for cold and 1 for warmth.
🔴 In the human PNS, nerve cells can be threadlike—their width is microscopic, but their length can be measured in meters.
🔴 There are over millions of nerve cells in human CNS, 100 billion neurons in the human brain and around 13,500,000 neurons in the spinal cord.
🔴 Sciatic nerve is the longest and broadest single nerve in the human body.
🔴An optic (cranial) nerve is the fundamental part of the CNS, and the human eye's most significant sensory nerve.
🔴 B vitamins must be replenished daily as they are only stored in the body in a very small amount.
⬆️ Look at the human nervous system depicted using advanced computer modeling.
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🔴 The human nervous system can transmit signals at speeds of 100 meters per second.
🔴 The slowest signal transmission occurs inside the skin.
🔴 Every square cm of human skin contains around 200 pain receptors but only 15 receptors for pressure, 6 for cold and 1 for warmth.
🔴 In the human PNS, nerve cells can be threadlike—their width is microscopic, but their length can be measured in meters.
🔴 There are over millions of nerve cells in human CNS, 100 billion neurons in the human brain and around 13,500,000 neurons in the spinal cord.
🔴 Sciatic nerve is the longest and broadest single nerve in the human body.
🔴An optic (cranial) nerve is the fundamental part of the CNS, and the human eye's most significant sensory nerve.
🔴 B vitamins must be replenished daily as they are only stored in the body in a very small amount.
⬆️ Look at the human nervous system depicted using advanced computer modeling.
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What science studies the nervous system?
Neuroscience, also known as Neural Science, is the study of how the nervous system develops, its structure, and what it does.
Neuroscientists focus on the brain and its impact on behavior and cognitive functions and study what happens to the nervous system when people have neurological, psychiatric and neurodevelopmental disorders.
Neuroscience is also often referred to in the plural, as neurosciences.
Neuroscience has traditionally been classed as a subdivision of biology, but today it’s an interdisciplinary science, which liaises closely with other disciplines, such as mathematics, linguistics, engineering, computer science, chemistry, philosophy, psychology, and medicine.
Some researchers say that neuroscience means the same as neurobiology. However, neurobiology looks at the biology of the nervous system, while neuroscience refers to anything to do with the nervous system.
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Neuroscience, also known as Neural Science, is the study of how the nervous system develops, its structure, and what it does.
Neuroscientists focus on the brain and its impact on behavior and cognitive functions and study what happens to the nervous system when people have neurological, psychiatric and neurodevelopmental disorders.
Neuroscience is also often referred to in the plural, as neurosciences.
Neuroscience has traditionally been classed as a subdivision of biology, but today it’s an interdisciplinary science, which liaises closely with other disciplines, such as mathematics, linguistics, engineering, computer science, chemistry, philosophy, psychology, and medicine.
Some researchers say that neuroscience means the same as neurobiology. However, neurobiology looks at the biology of the nervous system, while neuroscience refers to anything to do with the nervous system.
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What science studies the nervous system? Neuroscience, also known as Neural Science, is the study of how the nervous system develops, its structure, and what it does. Neuroscientists focus on the brain and its impact on behavior and cognitive functions and…
What are the major branches of modern neuroscience?
According to researchers, the following branches of neuroscience, based on research areas and subjects of study can be broadly categorized in the following disciplines (neuroscientists usually cover several branches at the same time):
✔️ Affective neuroscience – in most cases, research is carried out on laboratory animals and looks at how neurons behave in relation to emotions.
✔️ Behavioral neuroscience – the study of the biological bases of behavior. Looking at how the brain affects behavior.
✔️ Cellular neuroscience – the study of neurons, including their form and physiological properties at cellular level.
✔️ Clinical neuroscience – looks at the disorders of the nervous system, while psychiatry, for example, looks at the disorders of the mind.
✔️ Cognitive neuroscience – the study of higher cognitive functions that exist in humans, and their underlying neural bases. Cognitive neuroscience draws from linguistics, neuroscience, psychology and cognitive science. Cognitive neuroscientists can take two broad directions; behavioral/experimental or computational/modeling, the aim being to understand the nature of cognition from a neural point of view.
✔️ Computational neuroscience – attempting to understand how brains compute, using computers to simulate and model brain functions, and applying techniques from mathematics, physics and other computational fields to study brain function.
✔️ Cultural neuroscience – looks at how beliefs, practices and cultural values are shaped by and shape the brain, minds and genes over different periods.
✔️ Developmental neuroscience – looks at how the nervous system develops on a cellular basis; what underlying mechanisms exist in neural development.
✔️ Molecular neuroscience – the study of the role of individual molecules in the nervous system.
✔️ Neuroengineering – using engineering techniques to better understand, replace, repair, or improve neural systems.
✔️ Neuroimaging – a branch of medical imaging that concentrates on the brain. Neuroimaging is used to diagnose disease and assess the health of the brain. It can also be useful in the study of the brain, how it works, and how different activities affect the brain.
✔️ Neuroinformatics – integrates data across all areas of neuroscience, to help understand the brain and treat diseases. Neuroinformatics involves acquiring data, sharing, publishing and storing information, analysis, modeling, and simulation.
✔️ Neurolinguistics – studying what neural mechanisms in the brain control the acquisition, comprehension and utterance of language.
✔️ Neurophysiology– looks at the relationship of the brain and its functions, and the sum of the body’s parts and how they interrelate. The study of how the nervous system functions, typically using physiological techniques, such as stimulation with electrodes, light-sensitive channels, or ion- or voltage-sensitive dyes.
✔️ Paleoneurology – the study of the brain using fossils.
✔️ Social neuroscience – this is an interdisciplinary field dedicated to understanding how biological systems implement social processes and behavior. Social neuroscience gathers biological concepts and methods to inform and refine theories of social behavior. It uses social and behavioral concepts and data to refine neural organization and function theories.
✔️ Systems neuroscience – follows the pathways of data flow within the CNS and tries to define the kinds of processing going on there. It uses that information to explain behavioral functions.
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According to researchers, the following branches of neuroscience, based on research areas and subjects of study can be broadly categorized in the following disciplines (neuroscientists usually cover several branches at the same time):
✔️ Affective neuroscience – in most cases, research is carried out on laboratory animals and looks at how neurons behave in relation to emotions.
✔️ Behavioral neuroscience – the study of the biological bases of behavior. Looking at how the brain affects behavior.
✔️ Cellular neuroscience – the study of neurons, including their form and physiological properties at cellular level.
✔️ Clinical neuroscience – looks at the disorders of the nervous system, while psychiatry, for example, looks at the disorders of the mind.
✔️ Cognitive neuroscience – the study of higher cognitive functions that exist in humans, and their underlying neural bases. Cognitive neuroscience draws from linguistics, neuroscience, psychology and cognitive science. Cognitive neuroscientists can take two broad directions; behavioral/experimental or computational/modeling, the aim being to understand the nature of cognition from a neural point of view.
✔️ Computational neuroscience – attempting to understand how brains compute, using computers to simulate and model brain functions, and applying techniques from mathematics, physics and other computational fields to study brain function.
✔️ Cultural neuroscience – looks at how beliefs, practices and cultural values are shaped by and shape the brain, minds and genes over different periods.
✔️ Developmental neuroscience – looks at how the nervous system develops on a cellular basis; what underlying mechanisms exist in neural development.
✔️ Molecular neuroscience – the study of the role of individual molecules in the nervous system.
✔️ Neuroengineering – using engineering techniques to better understand, replace, repair, or improve neural systems.
✔️ Neuroimaging – a branch of medical imaging that concentrates on the brain. Neuroimaging is used to diagnose disease and assess the health of the brain. It can also be useful in the study of the brain, how it works, and how different activities affect the brain.
✔️ Neuroinformatics – integrates data across all areas of neuroscience, to help understand the brain and treat diseases. Neuroinformatics involves acquiring data, sharing, publishing and storing information, analysis, modeling, and simulation.
✔️ Neurolinguistics – studying what neural mechanisms in the brain control the acquisition, comprehension and utterance of language.
✔️ Neurophysiology– looks at the relationship of the brain and its functions, and the sum of the body’s parts and how they interrelate. The study of how the nervous system functions, typically using physiological techniques, such as stimulation with electrodes, light-sensitive channels, or ion- or voltage-sensitive dyes.
✔️ Paleoneurology – the study of the brain using fossils.
✔️ Social neuroscience – this is an interdisciplinary field dedicated to understanding how biological systems implement social processes and behavior. Social neuroscience gathers biological concepts and methods to inform and refine theories of social behavior. It uses social and behavioral concepts and data to refine neural organization and function theories.
✔️ Systems neuroscience – follows the pathways of data flow within the CNS and tries to define the kinds of processing going on there. It uses that information to explain behavioral functions.
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How many animals have ever existed on Earth?
📌Life appeared on Earth by 3.7 billion years ago. But those first organisms were very simple cells; it would be another 1.4 billion years before multicellular life showed up. Animals probably evolved even more recently, around 800 million years ago.
📌According to scientists, the total number of eukaryotic species on Earth was around 8.7 million, about 7.7 million of which were animals (roughly half were insects).
📌Researchers assume that 99.9% of species that have ever lived on Earth are extinct. So, 7.7 million could be multiplied by nearly 100 percent which puts the total number of animal species at roughly 770 million species.
📌Today, there are around 130 billion mammals, up to 428 billion birds, 3.5 trillion fish and an estimated 10 quintillion insects.
If we extrapolate out these figures using the proportions of the 7.7 million existing species, roughly, there have been approximately 4.5 x 10^27 animals ever on Earth.
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📌Life appeared on Earth by 3.7 billion years ago. But those first organisms were very simple cells; it would be another 1.4 billion years before multicellular life showed up. Animals probably evolved even more recently, around 800 million years ago.
📌According to scientists, the total number of eukaryotic species on Earth was around 8.7 million, about 7.7 million of which were animals (roughly half were insects).
📌Researchers assume that 99.9% of species that have ever lived on Earth are extinct. So, 7.7 million could be multiplied by nearly 100 percent which puts the total number of animal species at roughly 770 million species.
📌Today, there are around 130 billion mammals, up to 428 billion birds, 3.5 trillion fish and an estimated 10 quintillion insects.
If we extrapolate out these figures using the proportions of the 7.7 million existing species, roughly, there have been approximately 4.5 x 10^27 animals ever on Earth.
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What is holding our universe together?
⚛️Our universe is made up of atoms, which in most cases are not just floating around individually, but usually interacting with other atoms (or groups of atoms).
Atoms might be connected by strong chemical bonds and organized into molecules or crystals. Or they might form temporary, weak chemical bonds with other atoms that they bump into or brush up against.
❗️Both the strong bonds that hold molecules together and the weaker bonds that create temporary connections are essential as they are literally holding our universe together.
Chemical bonds are formed because atoms are trying to reach the most stable (lowest-energy) state that they can.
Chemical bonds broadly fall into 2️⃣ categories:
🔄 intra-bonds that hold one building block to another inside a compound
➡️⬅️ inter-bonds that attract one compound to another
Intra- and inter-bonding are further divided into different types, but electrons control all types of bonds.
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⚛️Our universe is made up of atoms, which in most cases are not just floating around individually, but usually interacting with other atoms (or groups of atoms).
Atoms might be connected by strong chemical bonds and organized into molecules or crystals. Or they might form temporary, weak chemical bonds with other atoms that they bump into or brush up against.
❗️Both the strong bonds that hold molecules together and the weaker bonds that create temporary connections are essential as they are literally holding our universe together.
Chemical bonds are formed because atoms are trying to reach the most stable (lowest-energy) state that they can.
Chemical bonds broadly fall into 2️⃣ categories:
🔄 intra-bonds that hold one building block to another inside a compound
➡️⬅️ inter-bonds that attract one compound to another
Intra- and inter-bonding are further divided into different types, but electrons control all types of bonds.
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What happens if atoms are gaining or losing electrons?
Some atoms become more stable by gaining or losing electrons.
When they do so, atoms form ions, or charged particles.
Ions come in 2️⃣ types:
➕Cations are positive ions formed by losing electrons. E.g., if a sodium atom loses an electron, it becomes a sodium cation, Na+.
➖Anions are negative ions formed by electron gain and named using the ending “-ide”: for example, the anion of chlorine (Cl-) is called chloride.
⚛️➡️⚛️The process itself is called electron transfer.
ℹ️The word ion comes from the Greek word ion or ienai, meaning “to go.” English scientist Michael Faraday coined the term in 1834.
ℹ️Certain ions are referred to in physiology as electrolytes (including sodium, potassium, and calcium). These ions are necessary for nerve impulse conduction, muscle contractions and water balance. Many sports drinks and dietary supplements provide these ions to replace those lost from the body via sweating during exercise.
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Some atoms become more stable by gaining or losing electrons.
When they do so, atoms form ions, or charged particles.
Ions come in 2️⃣ types:
➕Cations are positive ions formed by losing electrons. E.g., if a sodium atom loses an electron, it becomes a sodium cation, Na+.
➖Anions are negative ions formed by electron gain and named using the ending “-ide”: for example, the anion of chlorine (Cl-) is called chloride.
⚛️➡️⚛️The process itself is called electron transfer.
ℹ️The word ion comes from the Greek word ion or ienai, meaning “to go.” English scientist Michael Faraday coined the term in 1834.
ℹ️Certain ions are referred to in physiology as electrolytes (including sodium, potassium, and calcium). These ions are necessary for nerve impulse conduction, muscle contractions and water balance. Many sports drinks and dietary supplements provide these ions to replace those lost from the body via sweating during exercise.
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How ionic bonds are formed?
Ionic bonds are bonds formed between ions with opposite charges. It’s an intra-bond type.
🫙 For instance, positively charged sodium ions and negatively charged chloride ions attract each other to make sodium chloride, or table salt. Like many ionic compounds, it doesn't consist of just one sodium and one chloride ion; instead, it contains many ions arranged in a crystal lattice (repeating, predictable 3D pattern) ⬆️.
Within sodium chloride all of the attractions between the ions are strong. A lot of energy is required to pull these ions apart. This trait means sodium chloride has a high melting point and a high boiling point. Those charges also mean that when salt is dissolved in water or melted, it becomes a good conductor of electricity.
ℹ️ Just a few grams of salt could contain more than a septillion ions. It’s a quadrillion times a billion (or 1,000,000,000,000,000,000,000,000).
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Ionic bonds are bonds formed between ions with opposite charges. It’s an intra-bond type.
🫙 For instance, positively charged sodium ions and negatively charged chloride ions attract each other to make sodium chloride, or table salt. Like many ionic compounds, it doesn't consist of just one sodium and one chloride ion; instead, it contains many ions arranged in a crystal lattice (repeating, predictable 3D pattern) ⬆️.
Within sodium chloride all of the attractions between the ions are strong. A lot of energy is required to pull these ions apart. This trait means sodium chloride has a high melting point and a high boiling point. Those charges also mean that when salt is dissolved in water or melted, it becomes a good conductor of electricity.
ℹ️ Just a few grams of salt could contain more than a septillion ions. It’s a quadrillion times a billion (or 1,000,000,000,000,000,000,000,000).
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