Question: Which statement is not correct concerning the heartbeat? a. The atria contract at the same time. b. The ventricles relax at the same time. c.

Which statement is not correct concerning the heartbeat?
a. The atria contract at the same time.
b. The ventricles relax at the same time.
c. The AV valves open at the same time.
d. The semilunar valves open at the same time.
e. First the right side contracts; then the left side contracts.

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