Multiple Choice
Which statement about the heartbeat in mammals is true?
A) Only the ventricles contract in unison.
B) Only the atria contract in unison.
C) Atria contract in unison,and ventricles contract in unison.
D) The atrium and ventricle on the right side of the heart contract in unison.
E) The atrium and ventricle on the left side of the heart contract in unison.
Correct Answer:
Verified
Correct Answer:
Verified
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