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Question

Read the following and select the correct combination. 
  1. Lub sound - Closure  of semi lunar valves - Atrial diastole
  2. Dub sound - Closure of tricuspid valve - Ventricular systole
  3. Lub sound - Closure of Tricuspid, bicuspid valve - Ventricular systole
  4. Dub sound - Closure of semi lunar valves - Ventricular systole


Solution

The correct option is C Lub sound - Closure of Tricuspid, bicuspid valve - Ventricular systole
The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves (ventricular systole) whereas the second heart sound (dub) is associated with the closure of the semilunar valves (ventricular diastole). 

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