The Atrioventricular (AV)heart Valves Open and Close________

question 1

Multiple Choice

The atrioventricular (AV) heart valves open and close________.

• A)as the circular muscles surrounding them operate
• B)passively, depending on the pressure of the blood in the atria and ventricles
• C)entirely differently from the mechanism used to operate the semilunar valves.
• D)as papillary muscles and chordae tentinae pull them

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