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Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation1 Mark
MCQ
The second heart sound (dubb) is associated with the closure of
  • A
    Tricuspid valve.
  • B
    Semilunar valves.
  • C
    Bicuspid valve.
  • D
    Tricuspid and bicuspid valves.
✓

Answer

  1. Semilunar valves

Explanation:

During beginning of ventricular diastole the ventricles relax and the semilunar valves are closed. The second heart sound “dubb” is caused by the closure of semilunar valves and marks the end of ventricular systole. It lasts for 0.1 seconds.

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