Multiple choice

Which part of our body makes lub dub sound?

  1. Brain

  2. Heart

  3. Lungs

  4. Stomach

  5. Mouth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cardiac sounds typically described as lub-dub are caused by the closing of the cardiac valves. The first sound (lub) is caused by the closing of the mitral and tricuspid valves and the second dub is caused by the closing of the aortic and pulmonic valves.

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