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Which one among the following statements regarding heart sound is correct?

Options

  1. AHeart sounds are caused by the internal blood flow inside the heart
  2. BHeart sounds are caused by the external blood flow outside the heart
  3. CHeart sounds are caused by opening and closing of heart valves
  4. DNormal sounds are called 'murmurs'

Correct answer

C. Heart sounds are caused by opening and closing of heart valves

Step-by-step solution

The correct answer is option C

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