The pericardium is a double-walled sac that encloses the heart and serves as support and protection.
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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
Q53: The job of the heart valves is
Q54: The right atrium is a thin-walled receiving
Q56: The tricuspid valve separates the _ from
Q57: The phase of systole that results in
Q58: The heart's top and bottom chambers are
Q59: The _ is the layer of the
Q60: The heart is composed primarily of muscle.
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