The Opening and Closing of the Heart Valves Is Caused

question 113

Multiple Choice

The opening and closing of the heart valves is caused by

• A) contraction and relaxation of papillary muscles that pull on heart strings.
• B) pressure changes of alternating contraction and relaxation during the cardiac cycle.
• C) contraction of the smooth muscle in the walls of the great vessels leaving the heart.
• D) action potentials within the cusps of the valves.

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