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Second heart sound is...

Second heart sound is

A

'dup' at the beginning of diastole

B

lubb' at the beginning of systole

C

'lubb' at the end of systole

D

'dup' at the end of diastole

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "Second heart sound is", we need to analyze the heart sounds and their timing in relation to the cardiac cycle. ### Step-by-Step Solution: 1. **Understanding Heart Sounds**: The heart produces two main sounds during each cardiac cycle, commonly referred to as "lub" and "dup". These sounds are associated with the closing of heart valves. 2. **Identifying the Sounds**: - The first heart sound, "lub", occurs when the atrioventricular (AV) valves (the mitral and tricuspid valves) close at the beginning of ventricular systole (the contraction phase of the heart). - The second heart sound, "dup", occurs when the semilunar valves (the aortic and pulmonary valves) close at the beginning of ventricular diastole (the relaxation phase of the heart). 3. **Timing of the Second Heart Sound**: The second heart sound, "dup", is specifically produced at the beginning of diastole, which is when the ventricles are relaxing and filling with blood again. 4. **Conclusion**: Therefore, the second heart sound is "dup at the beginning of diastole". ### Final Answer: The second heart sound is "dup at the beginning of diastole". ---
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The second heart sound (dubb) is associated with the closure of

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