The long plateau in the action potential observed in cardiomyocytes is probably related with __________ staying longer in the cytosol.

Question

Quizplus · Accepted Answer

The long plateau in the action potential of cardiomyocytes is due to the slow entry and prolonged presence of calcium ions (Ca2+) in the cell. This is caused by the voltage-gated L-type calcium channels which remain open for an extended period, leading to an extended depolarization phase and a plateau in the action potential. Therefore, the correct answer is C, which includes calcium ions. The other ions (Na+, K+, and Cl-) are involved in the rising and falling phases of the action potential, but not in the plateau phase.

The Long Plateau in the Action Potential Observed in Cardiomyocytes