How does the nurse describe the cardiac action potential to a new coworker?
A) The cycle of depolarization and repolarization
B) The time it takes from the firing of the sinuatrial (SA) node to the contraction of the ventricles
C) The time between the contraction of the atria and the contraction of the ventricles
D) The cycle of the firing of the atrioventricular (AV) node and the contraction of the myocardium
A
Feedback:
The action potential of the cardiac muscle cell consists of five phases: Phase 0 occurs when the cell reaches a point of stimulation. This is called depolarization. Phase 2, or the plateau stage, is a process called repolarization. Phase 4 is when spontaneous depolarization begins again. The action potential involves electrolytes and polarization and does not involve timing of the cardiac cycle.
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