Question

explain heart sound​

Answer 1

The beating of heart produces characteristic sounds which can be heard by using stethoscope. In a normal person, two sounds are produced per heart beat. The first heart sound lubb’ is low pitched, not very loud and of long duration. It is caused partly by the closure of the bicuspid and tricuspid valves and partly by the contraction of muscles in the ventricles.

The second heart sound ‘dubb’ is high pitched, louder, sharper and shorter in duration. It is caused by the closure of the semilunar valves and marks the end of ventricular systole.

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Answer 2

Answer :-

■ The sounds produced by the heart while pumping blood, are known as "Heart sounds".

■ There are 4 types of heart sounds, designated as :-

• S1

• S2

• S3

• S4

■ The first sound is known as "Lubb" (S1), is a long and loud sound, created by the closure of the artrioventricular valves (Tricuspid and Bicuspid) at the begining of the ventricular systole.

■ The second sound is known as "Dupp" (S2), is a short and sharp sound, created by the closure of the semilunar valves towards the begining of the ventricular diastole (End of the ventricular systole).

■ The sounds "S3" and "S4" may not be audible, but they are usually very faint. These sounds are associated with rapid ventricular filling and Atrial systole.

■ The heart sounds provide valuable information about the working of the valves of the heart.

■ The "Murmur" of the heart is an abnormal sound, which is produced due to the improper functioning of the valves of the heart, resulting in "Stenosis" or "Incompetence".

■ The technique of listening to the heart sounds, is called "Auscultation".