It is the ________ that permits the compression necessary to pump large volumes of blood out of the ventricles.

A. arrangement of cardiac muscle in the heart wall
B. presence of skeletal muscle tissue in the heart skeleton
C. negative pressure inside the ventricles
D. presence of papillary muscles in the ventricles
E. absence of oxygenated blood in the atria


Answer: A

Anatomy & Physiology

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