When listening to the heart with a stethoscope what structures make the heart beat sounds? Papillary muscles Atria Cardiac muscle tissue Valves Coronary vessels
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The first heart sound ("lub") is caused by the closure of the atrioventricular valves (mitral and tricuspid valves), and the second heart sound ("dub") is caused by the closure of the semilunar valves (aortic and pulmonic valves). Show more…
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