★ Anatomy and Physiology- Cardiovascular Sysytem Quiz
At the instant following the second heart sound, which heart valves are open?
A. Both atrioventricular valves and semilunar valves
B. Atrioventricular valves only
C. All valves are closed
D. Semilunar valves only
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What divides the left side of the heart from the left side?
A. Atrium
B. Ventricles
C. Wall
D. Septum
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