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contains the air space and fluid that reduces the friction between the surfaces of the heart as it beats
pulmonary semilunar valve
valve that consists of three moon shaped flaps that assist blood flow from the right ventricle to the pulmonary trunk
connective tissue that attach to each cuspid, assists the valves closing during contraction
depression found between the atriums, remnant of the hole in the heart of the embryo that closes 2 days after birth
vein that empties into the right atrium that carries deoxygenated blood from the heart
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