When the muscles of the heart relax, the blood flows backward, forcing the ___________ between the chambers to close.
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Q49: The process of _ is too slow
Q50: Muscular animal hearts must generate enough force
Q51: In an insect's _ circulatory system, blood
Q52: The sound of a human heartbeat as
Q53: The pressure in the arteries is highest
Q55: Ultimately, the rhythm of the heart is
Q56: An increase in the amount of water
Q57: _ are the vessels that carry blood
Q58: In human hearts, ventricles receive blood directly
Q59: The sinoatrial (SA) node is also called
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