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  • Identify the subsequent stage that immediately follows the 'dup' (second heart sound):    Option: 1 Isovolumetr

Identify the subsequent stage that immediately follows the 'dup' (second heart sound):

 

 

Option: 1

Isovolumetric contraction


Option: 2

Isovolumetric relaxation


Option: 3

Third heart sound

 


Option: 4

Atrial systole


Answers (1)

best_answer

The second heart sound, often referred to as 'dup,' occurs during the closure of the semilunar valves (pulmonary and aortic valves) at the beginning of ventricular diastole. After the 'dup' sound, the heart progresses into the phase known as isovolumetric relaxation. During isovolumetric relaxation, both the atrioventricular (AV) valves (mitral and tricuspid valves) and semilunar valves are closed. The ventricles are in a relaxed state, and no blood is being actively ejected or filled into the chambers. Instead, the ventricles are momentarily in a state of isovolumetric relaxation, where the pressure in the ventricles decreases, and the heart muscle begins to relax and prepare for the next cardiac cycle.

Therefore, option 2, "Isovolumetric relaxation," is the correct answer.

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Gaurav

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