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What is Cardiac Cycle: Ventricular Filling Explained about?
The cardiac cycle begins with the firing of the SA node, stimulating atrial depolarization. During ventricular filling, atrial contraction forces blood into the ventricles. Isovolumetric contraction occurs as the ventricles contract before ejection, with no change in volume. Ejection starts when ventricular pressure exceeds aortic and pulmonary pressures, opening the semilunar valves and ejecting 60% of blood, mostly in the first third. Isovolumetric relaxation follows ejection as pressures fall with valves
- Author
- janine gapuz
- Language
- EN