Multiple choice general knowledge sports

The terms Lubb - Dubb relate to which one of the following?

  1. Heart

  2. Eyes

  3. Teeth

  4. Lungs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lubb and Dubb are the two sounds produced by the heart valves during a cardiac cycle. Lubb (S1) is caused by the closure of the atrioventricular valves (mitral and tricuspid), while Dubb (S2) is caused by the closure of the semilunar valves (aortic and pulmonary).

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