The ________ is the layer of the heart that contains the cardiac conduction system.
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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
Q60: The heart is composed primarily of muscle.
Q61: The coronary artery that feeds blood to
Q62: The two phases of the cardiac cycle
Q63: The superior vena cava returns blood to
Q64: The normal amount of blood circulated by
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