Cardiac Cycle - Reduced Filling (Phase 7)
A-V Valves Open
As the ventricles continue to fill with blood and expand, they become less compliant and the intraventricular pressures rise. The increase in intraventricular pressure reduces the pressure gradient across the AV valves so that the rate of filling falls late in diastole.
In normal, resting hearts, the ventricle is about 90% filled by the end of this phase. In other words, about 90% of ventricular filling occurs before atrial contraction (phase 1) and therefore is passive.
Aortic and pulmonary arterial pressures continue to fall during this period.
Jump to other phases:
- Phase 1 - Atrial Contraction
- Phase 2 - Isovolumetric Contraction
- Phase 3 - Rapid Ejection
- Phase 4 - Reduced Ejection
- Phase 5 - Isovolumetric Relaxation
- Phase 6 - Rapid Filling