Health, 17.03.2020 04:36, Girly8081

The opening of any heart valve only occurs when: A. the blood pressure in the heart chamber from which blood is flowing is higher than the blood pressure in the chamber to which the blood is supposed to flow. B. the cardiac muscle surrounding the valve contracts. C. the chordae tendinae pull it open. D. blood tries to flow in an incorrect/opposite direction. E. papillary muscles push it open.

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The opening of any heart valve only occurs when: A. the blood pressure in the heart chamber from whi...