Which of the following describes events in the heart in the correct order?

1) first heart sound heard, 2) valves between ventricles and body close, 3) second heart sound heard, 4) valves between atria and ventricles close

1) valves between ventricles and body close, 2) first heart sound heard, 3) valves between atria and ventricles close, 4) second heart sound heard

1) first heart sound heard, 2) valves between atria and ventricles close, 3) second heart sound heard, 4) valves between ventricles and body close

1) valves between atria and ventricles close, 2) first heart sound heard, 3) valves between ventricles and body close, 4) second heart sound heard

Ans.

The heart sounds are sounds generated by heart during the blood flow through it. These sounds reflect the turbulence generated during the closing of different heart valves.

The first heart sound or S1 is generated when the valves between atrai and ventricles close. It is often described as lub and is heard at the beginning of systole.

The second heart sound or S2 is generated when the valves between the ventricles and body close. It is described as dub, and is heard at the end of systole.

Thus, the correct answer is option). '1) Valves between ventricles and atria close, 2) first heart sound (S1) heard, 3) valves between body and ventricles close, 4) second heart sound heard (S2).'

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