A new nurse on the cardiac unit is taking a class in the anatomy and physiology of the heart. What does the nurse learn is the cardiac action potential?
A) The cycle of depolarization and repolarization
B) The time it takes from the firing of the 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 AV node and the contraction of the myocardium
Ans: A
Feedback: This exchange of ions creates a positively charged intracellular space and a negatively charged extracellular space that characterizes the period known as depolarization. Once depolarization is complete, the exchange of ions reverts to its resting state; this period is known as repolarization. The repeated cycle of depolarization and repolarization is called the cardiac action potential. Cardiac action potential is not defined by options B, C, or D.
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