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Questions and Answers
What happens during ventricular depolarization?
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?
What is the approximate percentage of ventricular filling that occurs during atrial systole?
- 10%
- 30%
- 50%
- 70% (correct)
What occurs during isovolumetric relaxation?
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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