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What valve must close before blood will flow from the heart to the various body regions?
Wiki User
∙ 9y ago
The atrioventricular valves close during systole, when the heart pumps blood out to the various body regions. The tricuspid valve closes to prevent backflow from the right ventricle to the right atrium, and the mitral valve closes to prevent backflow from the left ventricle to the left atrium.
Wiki User
∙ 9y ago
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Since the valves act as the doors of the heart what might happen if these doors do not close?
The valves have to open to let blood flow into a chamber, and close before the blood flows back. If the valves do not open and close precisely on schedule, or if they fail to open or close completely, the blood will not flow efficiently. This can cause fluctuations in blood pressure, lack of flow to organs, or damage to the muscles of the heart. For example, if the aortic valve between the heart and the aorta does not close after the left ventricle contracts, there will be back pressure into the ventricle, less blood pumped out of the heart, and lower pressure in the arteries.
Why do the hearts valve close?
In a 4-chambered heart animal, the valves on the heart close to prevent back-flow from the ventricle into the atrium. In this way, the valves assure that the heart propels the blood forward with sufficient pressure and volume to reach all regions of the body.
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