Doubt by Anand Jat
Sir I am confused little bit in between 2 lines, which action is happen first and which one will later
(1) the influx of sodium Ion leads to the depolarization of cell membrane called as action potential,,,,, or,,,,,,
(2) or due to the depolarization of cell membrane as it we call action potential lead to the influx of sodium ion,,,,,,,,, which one of the above two line is correct
Answers
Answer by HowTo Tutorials
Answer Will Be [1]
when sodium ions enters into the cell membrane through sodium channels depolarization[action potentials] are generated which in turn activates the s.reticulum to release calcium ions into sarcoplasm
Answer by Isha Agarwal
An action potential begins when a depolarization increases the membrane voltage so that it crosses a threshold value. At this threshold, voltage-gated Na+ channels in the membrane open, allowing many sodium ions to rush into the cell. This influx of sodium ions makes the membrane potential increase very rapidly.
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