heart sounds

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Normally, during one cardiac cycle, two heart sounds (usually described as ‘lub-dub’ or ‘lub-dup') that can he heard over the chest through a stethoscope. The first sound is caused by closure of the atrioventricular valves towards the beginning of systole, the other is caused by the closure of the semilunar valves guarding the aorta and pulmonary artery at the beginning of ventricular diastole. Compare heart murmur.

Subjects: Sports and Exercise Medicine.

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