ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What causes the valves of the heart to open/close?
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an electric impulse
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pressure
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muscle tissue
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Pacemaker cells
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Explanation:
Detailed explanation-1: -As the heart muscle contracts and relaxes, the valves open and shut. This lets blood flow into the ventricles and atria at alternate times.
Detailed explanation-2: -The stellate orifice occurs when the ventricular pressure equals the aortic pressure. commissures causes the leaflets to separate and the valve to open.
There is 1 question to complete.