Multiple choice

While using a stethoscope, a physician hears a sound of ‘LUBB’. Which activity is responsible for producing this sound?

  1. Opening of mitral and tricuspid valves

  2. Closing of mitral and tricuspid valves

  3. Closing of aortic semilunar valves

  4. Opening of pulmonary semilunar valves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The first sound ‘LUBB’ is produced when the ‘atrio-ventricular’ valves get closed sharply at the start of ventricular systole.

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