00:01
After a threshold stimulus, an action potential is initiated.
00:04
So, when an action potential is initiated, the nerve cell, the nerve cell, it gets depolarized.
00:22
In this case, the sodium, that is the na positive, it enters the cell.
00:30
It enters the cell and the potassium, that is k -positive, moves out of the cell, moves out of the cell.
00:39
Then this impulse passes down the exon.
00:44
This impulse passes down the exon and depolarizes the exon.
00:48
As it moves ahead, a part of exon, a part of exon repolarizes as sodium potential.
01:02
As sodium potassium pump restores the membrane potential...