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The first heart sound ‘Lub’ is due to:

(a) Auricular diastole
(b) Auricular systole
(c) Ventricular diastole
(d) ventricular systole

Anurag Mishra Professor Asked on 28th May 2016 in Biology.
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    Answer: (d) ventricular systole

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    Anurag Mishra Professor Answered on 30th May 2016.
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