lubb dup sounds heard in heart beat are due to?
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Typical 'lub-dub' sounds heard in heartbeat are due to the closure of bicuspid-tricuspid valves followed by semilunar valves. ... This sound represents the closure of the mitral and tricuspid valves and is a low pitched, dull sound at the beginning of ventricular systole.
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The period between the end of one heart beat to the end of the next heart beat is called a cardiac cycle. The cardiac cycle is formed of three phases – atrial systole, ventricular systole and joint diastole.
During a ventricular systole, the closing of auriculoventricular valves at the start of the ventricular systole produces the first heart sound called lubb or systolic sound.
During a joint diastole, the rapid closure of semilunar valves at the beginning of the ventricular diastole produces the second heart sound called dup.
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