Typical 'lub-dub' sounds heard in heartbeat are due to .............. .

Closing of bicuspid and tricuspid valves

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Closing of semi-lunar valves

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Closure of bicuspid and tricuspid valves followed by semi-lunar valves

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The entry and exit of blood from heart

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Solution

The correct option is B Closure of bicuspid and tricuspid valves followed by semi-lunar valves
The 'lub' is the first heart sound, commonly termed as S1 and is caused by the turbulence caused by the closure of the mitral (or bicuspid) and tricuspid valves at the start of systole. The second sound 'dub' or S2 is caused by the closure of aortic and pulmonic (Semi-lunar) valves, marking the end of systole. Thus, the correct answer is option (C), 'Closure of bicuspid and tricuspid valves followed by semi-lunar valves'.

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Similar questions

Heart sounds are produced due to
(a) Closure of tricuspid and bicuspid valves
(b) Rushing of blood through valves producing turbulence
(c) Closure of atrioventricular and semilunar valves
(d) Entry of blood into auricles

The second heart sound (dubb) is associated with the closure of ?
(a) tricuspid valve
(b) semilunar valve
(c) bicuspid valve
(d) tricuspid and bicuspid valve

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