Which of the following characterize the ‘dub’ sound?
I. High pitch
II. Low pitch
III. Louder
IV. Sharper
V. Less loud
VI. Less sharp
VII. Longer duration
VIII. Shorter duration

I, III, IV, VIII

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II, V, VI, VII

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I, V, IV, VII

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II, III, VI, VIII

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Solution

The correct option is A I, III, IV, VIII
The heart sound ‘dub’ is produced at the closure of semilunar valves. It is louder, sharper, high pitched and persists for a shorter period of time.
The heart sound ‘lubb’ is produced at the closure of AV valves. It is less loud, less sharp, low pitched and persists for a longer period of time.

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