The excitation and contraction of the heart begins with the:

A. contraction of the right side of the heart followed by the contraction of the left side.
B. contraction of both atria followed by the contraction of both ventricles.
C. contraction of both ventricles followed by the contraction of both atria.
D. contraction of the left side of the heart followed by the contraction of the right side.


Answer: B

Nursing

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