The Opening and Closure of the Atrioventricular and Semilunar Valves

question 31

Multiple Choice

The opening and closure of the atrioventricular and semilunar valves is driven by

• A) differences in pressure across the valve.
• B) contraction of the valve.
• C) contraction of the ventricle and atria that pull the valves into place.
• D) contraction and relaxation of the valve.
• E) contraction of muscles attached to the valves.

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