10. Which statement about cardiac action potential is a. A difference with cardi

Question

10. Which statement about cardiac action potential is a. A difference with cardiac muscle vs. action potential in other excitable cells is the plateau depolarize and contract together ere depolarization is maintained long enough to allow all the heart muscle cells to b. Like action on potentials in other excitable cells, a cardiac myocyte in the resting state has a embrane potential and opening of voltage-gated Na channels cause c. During plateau, Na channels a d. Caž channels close slowly while many K' channels open, allowing repolarization of the e. None. All of the above are true. depolarization. repolarization to occur membrane after plateau phase. re inactive, K' flows out while Ca? flows in order for

Explanation / Answer

The cardiac action potential is small change in the membrane potential of heart cells across membrane. The cardiac action potential has many phases like phase 0,phases 1,1,3 and 4.

Phase 2 is known as plateau phase. During this phase the membrane potential remains almost constant due to very very slow repolarization. Sodium channels are not inactivated, but they are open whereas sodium potassium pump begins to work. Potassium is actively introduced into the cell and calcium is released from Sarcoplasmic reticulum. Keeping in view all these events, option C incorrect.

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