Which one of the following is a matching pair?

Biology Body Fluids and Circulation General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

Lubb-Sharp closure of AV valves at the beginning of ventricular systole.

Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole.

Pulsation of the radial artery-Valves in the blood vessels.

Purkinje fibres – Initiation of the heart beat.

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The first heart sound forms the "lub" of "lub-dub". It is caused by the sudden block of reverse blood flow due to closure of the atrioventricular valves, i.e., tricuspid and mitral (bicuspid), at the beginning of ventricular contraction, or systole.

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