Biology, 15.02.2020 00:16 chaserandall2004

The opening and closing of the heart valves is caused by
action potentials within the cusps of the valves.
contraction of the smooth muscle in the walls of the great vessels leaving the heart.
contraction and relaxation of papillary muscles that pull on heart strings.
pressure changes of alternating contraction and relaxation during the cardiac cycle.

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The opening and closing of the heart valves is caused by
action potentials within the cusps o...

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