During systole, which event primarily occurs?

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Multiple Choice

During systole, which event primarily occurs?

Explanation:
During systole, the ventricles contract. Systole is the pumping phase of the heart, where the ventricles generate enough pressure to push blood into the aorta and pulmonary trunk. As they contract, the semilunar valves open to eject blood, and the AV valves close to prevent backflow. Atrial contraction occurs later, as part of atrial systole, and ventricular relaxation happens during diastole. Atria filling mainly happens when the heart is relaxed, not during the main systolic pumping.

During systole, the ventricles contract. Systole is the pumping phase of the heart, where the ventricles generate enough pressure to push blood into the aorta and pulmonary trunk. As they contract, the semilunar valves open to eject blood, and the AV valves close to prevent backflow. Atrial contraction occurs later, as part of atrial systole, and ventricular relaxation happens during diastole. Atria filling mainly happens when the heart is relaxed, not during the main systolic pumping.

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