Multiple choice

Which of the following statements is correct regarding the normal heart sound in a healthy person?

  1. The first heart sound, i.e. lub corresponds to the closure of mitral and tricuspid valves.

  2. The first heart sound, i.e. lub occurs just before the R wave of the ECG.

  3. The first heart sound, i.e. lub splits into two components during inspiration.

  4. The second heart sound i.e .dub occurs during the T-wave.
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A Correct answer
Explanation

Since the first heart sound (lub) is caused by closure of the atrio-ventricular valves, it must occur after the onset of ventricular contraction, which follows the R wave.

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