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Unformatted text preview: blood through the aortic semilunar valve, into a large artery, the aorta, and throughout the body. The following events occur in the left ventricle, simultaneously and analogously with those of the right ventricle: 1. When the left ventricle contracts, the left AV valve closes and prevents blood from moving back into the right atrium. As in the right AV valve, the chordae tendineae prevent overextension of the left AV valve. 2. When the left ventricle relaxes, this results in less pressure in the left ventricle and higher pressure in the aorta. This high pressure causes the aortic semilunar valve to close, thus preventing the return of blood to the left ventricle....
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- Spring '10