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.

Question

Quizplus · Accepted Answer

In mammals, the heartbeat involves the atria and ventricles contracting in unison to pump blood through the circulatory system. Option A, B, D, and E are incorrect as they do not describe the complete or accurate contraction pattern of the heart.

Which Statement About the Heartbeat in Mammals Is True