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Q.

Which one is the first heart sound?

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a

‘Dub’ sound, produced during closure of atrioventricular valves

b

‘Lub’ sound, produced during closure of atrioventricular valves

c

‘Lub’ sound, produced during closure of semilunar valves

d

‘Dub’ sound, produced during closure of semilunar valves

answer is B.

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Detailed Solution

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The first heart sound (lub) is associated with the closure of the atrioventricular valves (tricuspid and bicuspid valves).  The second heart sound (dub) is associated with the closure of the semilunar valves.

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