In mammalian hearts, the left and right ventricles contract at the same time. The atria also contract at the same time, but their contraction is separate from the ventricles and serves to fill the ventricles with blood before they contract. This coordinated contraction allows for efficient pumping of blood throughout the body.

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In Mammalian Hearts

Question 9

Multiple Choice

In mammalian hearts,

A) all four chambers contract at the same time.
B) the left and right ventricles contract alternately.
C) the left atrium and ventricle contract simultaneously.
D) the left and right ventricles contract at the same time.

Correct Answer: