If there are NOT electrical event occurring in the heart then:
A. The heart will start responding to the parasympathetic nervous system.
B. The heart will start to fibrillation.
C. No mechanical events will be occurring in the heart either.
D. The heart will start responding to the sympathetic nervous system.
Answer: C. No mechanical events will be occurring in the heart either.
Each heartbeat, or mechanical contraction of the heart, has two distinct components of electrical activity: depolarization (contraction) and repolarization (relaxation). In the first component, depolarization, electrical charges of the heart muscle change from positive to negative and cause heart muscle contraction. In the second component, repolarization, the electrical charges of the heart muscle return to positive and cause relaxation of the heart muscle. Hence if there is no electrical event, then there cannot be a mechanical event (or pulse).
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