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https://zankoline.co/2019/01/14/%d9%88%db%95%d8%b2%d8%a7%d8%b1%db%95%d8%aa%db%8c-%d8%ae%d9%88%db%8e%d9%86%d8%af%d9%86%db%8c-%d8%a8%d8%a7%d9%84%d8%a7-%d9%86%d8%a7%d9%88%db%8c-%d9%a1%d9%a0%d9%a6-%d8%ae%d8%a7%d9%88%db%95%d9%86-%d8%a8/
Why does depolarization happen