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#Question id: 30054


The fourth heart sound is produced by:

#Unit 7. System Physiology – Animal
  1. Closure of the aortic and pulmonary valves
  2. Vibrations in the ventricular wall during systole
  3. Due to ventricular filling
  4. Closure of the mitral and tricuspid valves

Answer:- Option(s): 3


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