What causes heart valves to open and close? A. pressure differences across the valves as each chamber contracts and relaxes B. pull of the chordae tendinae on the valves C. pull of the papillary muscles in the ventricles D. quantity of blood in the heart chambers
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The opening and closing of the heart valves is caused by Multiple Choice action potentials within the cusps of the valves. pressure changes of alternating contraction and relaxation during the cardiac cycle. contraction and relaxation of papillary muscles that pull on heart strings. contraction of the smooth muscle in the walls of the great vessels leaving the heart.
Sri K.
Structures Associated with Valves Complete the following sentences about the functioning of the valves.
Adi S.
The function of the chordae tendineae is to pull the walls of the ventricles inward during contraction open the semilunar valves open the AV valves prevent eversion of the AV valves during ventricular systole hold the heart in place within the mediastinum;
Bryan V.
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