Cardiac Cycle Physiology

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Questions and Answers

What happens during ventricular depolarization?

  • The aortic and pulmonic valves open
  • The mitral and tricuspid valves close (correct)
  • Ventricular pressure rises
  • Ventricular ejection takes place

What is the approximate percentage of ventricular filling that occurs during atrial systole?

  • 10%
  • 30%
  • 50%
  • 70% (correct)

What occurs during isovolumetric relaxation?

  • Ventricular filling takes place
  • Ventricular pressure rises
  • Ventricular ejection occurs
  • Ventricular pressure falls below pressure in the aorta and pulmonary artery (correct)

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Study Notes

  • During ventricular depolarization, tension in the ventricles increases, which leads to closure of the mitral and tricuspid valves.
  • The rise in pressure within the ventricles leads to ejection of blood from the ventricles.
  • During ventricular ejection, the aortic and pulmonic valves open, and the ventricles eject blood.
  • Isovolumetric relaxation occurs when ventricular pressure falls below pressure in the aorta and pulmonary artery.
  • Ventricular filling occurs during atrial systole, and about 70% of ventricular filling takes place during this phase.
  • Atrial systole supplies the ventricles with the remaining 30% of the blood for each heartbeat.

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