The heart sound dup is produced when

mitral valve is closed

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semi-lunar valves at the base of aorta get closed

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tricuspid valve is opened

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mitral valve is opened

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Solution

The correct option is B
semi-lunar valves at the base of aorta get closed

The “dup” sound is produced by the closure of the semilunar valves at the start of ventricular relaxation. It lasts for 0.1 seconds and its principle frequency is 50 cycles/sec. It is higher pitched, louder, sharper and of short duration as compared to ‘lub’. The semilunar valves close to prevent any backflow of blood from aorta to the ventricles

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Similar questions

Q. Distinguish between mitral valve and semi lunar valve.

The second heart sound (dubb) is associated with the closure of ?
(a) tricuspid valve
(b) semilunar valve
(c) bicuspid valve
(d) tricuspid and bicuspid valve

The valve present between the right atrium and the right ventricle is the
(a) tricuspid valve (b) bicusid valve (c) semi - lnar valve (d) mitral valve

Q. The mitral valve and tricuspid valve, controls blood flow from

Q. Which of the following events does not take place during a ventricular systole
i. Due to the ventricular systole, ventricular pressure decreases.
ii. During the end of ventricular systole the semilunar valves open up.
iii. During the start of the ventricular systole the bicuspid and tricuspid valves close
iv. Due to the closure of the atrio-ventricular valves, dup sound is produced.

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