Which phase is the Ventricular Ejection phase?

Which phase is the Ventricular Ejection phase?

• A. Isovolumetric Contraction
• B. Ejection
• C. Atrial Systole
• D. Isovolumetric Relaxation

Answer: (B)

Ventricular ejection is the part of the heartbeat when the ventricles actually push blood out into the aorta and pulmonary trunk. This happens after the ventricle contracts enough to open the semilunar valves, so blood is rapidly ejected during systole. It follows the earlier isovolumetric contraction, where the ventricles contract but no blood leaves because all valves are closed. The atria contribute to filling earlier in the cycle (atrial systole) and aren’t involved in ejecting blood. After the ejection phase, the ventricles relax and the semilunar valves close, marking isovolumetric relaxation.

Ventricular ejection is the part of the heartbeat when the ventricles actually push blood out into the aorta and pulmonary trunk. This happens after the ventricle contracts enough to open the semilunar valves, so blood is rapidly ejected during systole. It follows the earlier isovolumetric contraction, where the ventricles contract but no blood leaves because all valves are closed. The atria contribute to filling earlier in the cycle (atrial systole) and aren’t involved in ejecting blood. After the ejection phase, the ventricles relax and the semilunar valves close, marking isovolumetric relaxation.