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STD 11 - 15. Body fluids and criculations — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 15. Body fluids and criculations1 Mark
MCQ
Which one of the following is a matching pair?
  • ✓
    Lubb - Sharp closure of $AV$ valves at the beginning of ventricular systole.
  • B
    Dup - Sudden opening of semilunar valves at the beginning of ventricular diastole.
  • C
    Pulsation of the radial artery valves in the blood vessels.
  • D
    Purkinje fibres-Initiation of the heart beat
✓

Answer

Correct option: A.
Lubb - Sharp closure of $AV$ valves at the beginning of ventricular systole.
a
Lubb sound is caused partly by the closure of the bicuspid and tricuspid valves and partly by the contraction of the muscles in the ventricles. Lubb is the first heart sound

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