The job of the heart valves is to prevent backflow of blood.
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Q48: The left atrium pumps blood into the
Q49: The heart has three layers: the endocardium,myocardium,and
Q50: The half-moon-shaped valves are the _ and
Q51: The three main coronary arteries are the
Q52: The heart chamber that has the greatest
Q54: The right atrium is a thin-walled receiving
Q55: The pericardium is a double-walled sac that
Q56: The tricuspid valve separates the _ from
Q57: The phase of systole that results in
Q58: The heart's top and bottom chambers are
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