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At the beginning of a ventricular contraction, all of the valves are closed. The valves don't open until _____.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. At the beginning of a ventricular contraction, all of the valves are closed. The valves don't open until _____.





 
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