Breathing and Exchange of GasesHard

Question

Which one of the following is a correctmatching pair?

Options

A.Lubb - Sharp closure of AV valves at the beginning of ventricular systole.
B.Dup - Sudden opening of semilunar valves at the befinning of ventricular diastole.
C.Pulsation of the radial artery valves in the blood vessels.
D.Purkinje fibrs - Initiation of the heart beat.

Solution

Lubb sound is caused pertly by by the closure of the bicuspid and tricuspid valaes and partly by the contrsction of the muscles in the ventricles. Lubb is the first heart sound.

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