Repolarization of heart muscle cells is caused by ____ the cells through voltage-gated channels. A potassium entering B potassium leaving C sodium entering D sodium leaving E calcium entering
| A |
potassium entering
|
|
| B |
potassium leaving
|
|
| C |
sodium entering
|
|
| D |
sodium leaving
|
|
| E |
calcium entering
|
Voltage-gated channels are defined as the transmembrane proteins that will play essential roles in the cell's electrical signaling.
Repolarization is defined as the return of the ions to their previous or old resting state, which further, corresponds with the myocardial muscle relaxation.
After a delay which is termed as the absolute refractory period, there will be the termination of the action potential taking place resulting in the opening of potassium channels thus, allowing the potassium ions (K+) to leave or go out from the cell and causes the membrane potential to become negative again. This is termed as repolarization. Therefore, repolarization is an action potential stage in which the cell will experience a voltage decrease due to the efflux of potassium ions (K+).
Therefore, option (B) is correct.
Thus, all the other options (A), (C), (D), and (E) are incorrect.
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