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Body Fluids and Circulations
Question
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First heart sound is produced during closure of

  • auriculo-ventricular valves

  • eustachian valve

  • sinus valve

  • seminular valves

Answer

A.

auriculo-ventricular valves

First heart sound is produced during closure of auriculo- ventricular or AV node. The first sound is lubb. It is low pitched and is of long duration. It is produced by tight closure of bicupsid and tricupsid valve at the start of ventricular contraction.

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