New nurses on the telemetry unit have been paired with preceptors. One new nurse asks her preceptor to explain depolarization. What would be the best answer by the preceptor?
A) "Depolarization is the mechanical contraction of the heart muscles."
B) "Depolarization is the electrical stimulation of the heart muscles."
C) "Depolarization is the electrical relaxation of the heart muscles."
D) "Depolarization is the mechanical relaxation of the heart muscles."
Ans: B
Feedback:
The electrical stimulation of the heart is called depolarization, and the mechanical contraction is called systole. Electrical relaxation is called repolarization, and mechanical relaxation is called diastole.
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