Question

The steep repolarization to rest potential phase of the action potentials of myocardial contractile cells occurs when conductance to which ion(s) decrease?

1) Ca
2) K
3) Na
4) A and B
5) A and C

Answer 1

The steep repolarization to rest potential phase of the action potentials of myocardial contractile cells occurs when conductance to K+ ions decrease.

Step-by-step explanation:

The steep repolarization to rest potential phase of the action potentials of myocardial contractile cells occurs when conductance to K+ ions decrease. During repolarization, the K+ channels open, allowing K+ ions to exit the cell. This movement of K+ ions helps bring the membrane potential back to its resting state.