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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 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 Valves in the blood vessels - radial artery
  • D
    Initiation of the heart beat - Purkinje fibres
✓

Answer

Correct option: A.
Lubb - Sharp closure of $AV$ valves at the beginning of ventricular systole
a
First sound of heart is lubb (a long and booming sound), created by the closure of atrio-ventricular valve $(AV)$, tricuspid and bicuspid at the beginning of ventricular systole. At the beginning of ventricular diastole, the semilunar valves close, producing the second sound 'dup'

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