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PTECH Physiology QUESTION #3246
Question 1
The 'Systolic' sound heard through a stethoscope (the first Lub) is caused by:
  • Opening of the Aorta
  • Closing of the AV valves (Mitral/Tricuspid)✔️
  • Closing of the Semilunar valves
  • Blood hitting the lungs
Correct Answer Explanation
The 'Lub' sound occurs at the start of ventricular systole.