The heart sounds normally heard by a physician while holding a stethoscope onto the left side of the chest of the patient are due to

Contraction of atrial chambers.

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Contraction of ventricular chambers.

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Closure of the atrioventricular valves.

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Relaxation of the semilunar valves.

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Solution

The correct option is C Closure of the atrioventricular valves.
In healthy adults, there are two normal heart sounds often described as a lub and a dub, that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves (AV) and semilunar valves respectively.

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Similar questions

Q. Very short answer type.
Name the heart sounds as heard by stethoscope, caused due to:
closure of semilunar valves at the beginning of ventricular diastole.

Q. Very short answer type.
Name the heart sounds as heard by stethoscope, caused due to:
closure of AV valves at the start of ventricular systole

Heart sounds are produced due to
(a) Closure of tricuspid and bicuspid valves
(b) Rushing of blood through valves producing turbulence
(c) Closure of atrioventricular and semilunar valves
(d) Entry of blood into auricles

Q. Read the following statements and select the correct option.
A. Damage to chordae tendinae of semilunar valves in aorta causes back flow of blood in left ventricle.
B. Closure of atrio-ventricular valves during ventricular systole generates first heart sound.

Q. Read the following statements and select the correct option.
A. Damage to chordae tending of semilunar valves in aorta causes back flow of blood in left ventricle.
B. Closure of atrio-ventricular valves during ventricular systole generates first heart sound

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