Question:
The second heart sound (dub) occurs at the beginning of:
The second heart sound (dub) occurs at the beginning of:
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First heart sound (lub): systole.
Second heart sound (dub): diastole.
Closure of valves produces sounds.
Second heart sound (dub): diastole.
Closure of valves produces sounds.
Updated On: Aug 18, 2026
- Systole
- Diastole
- Iso-volumic contraction
- None above
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Heart sounds are produced during the cardiac cycle.
Each sound corresponds to a specific event.
Step 2: Key Formula or Approach:
No specific formula.
Need to know heart sounds.
Step 3: Detailed Explanation:
The second heart sound (dub) occurs at the beginning of diastole.
It is produced by the closure of semilunar valves.
The first heart sound (lub) occurs at the beginning of systole.
Thus, the second sound occurs during diastole.
Step 4: Final Answer:
The second heart sound occurs at the beginning of diastole.
Hence, the correct option is (B).
Heart sounds are produced during the cardiac cycle.
Each sound corresponds to a specific event.
Step 2: Key Formula or Approach:
No specific formula.
Need to know heart sounds.
Step 3: Detailed Explanation:
The second heart sound (dub) occurs at the beginning of diastole.
It is produced by the closure of semilunar valves.
The first heart sound (lub) occurs at the beginning of systole.
Thus, the second sound occurs during diastole.
Step 4: Final Answer:
The second heart sound occurs at the beginning of diastole.
Hence, the correct option is (B).
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