What happens during ventricular systole?

What happens during ventricular systole?

• A. Relaxation Of The Ventricles.
• B. Contraction Of The Ventricles Pushes Blood Into The Arteries.
• C. Blood Returns To The Heart From The Veins.
• D. Atria Contract To Eject Blood.

Answer: (B)

Ventricular systole is the phase when the ventricles contract, raising their intraventricular pressure. This pressure pushes blood out of the heart into the arteries—the aorta and the pulmonary artery—through the open semilunar valves. The atrioventricular valves are closed at this moment, which helps prevent backflow into the atria, and the heart sound heard is related to valve closure signals at the start of this contraction phase. After the ventricles finish contracting, they relax (diastole), the semilunar valves close, and the cycle begins again with filling of the ventricles. So this phase specifically describes the ventricles squeezing and ejecting blood into the arteries. Relaxation of the ventricles is diastole; venous return occurs as blood flows back to the heart mainly during diastole; atria contracting to eject blood refers to atrial systole, not ventricular systole.

Ventricular systole is the phase when the ventricles contract, raising their intraventricular pressure. This pressure pushes blood out of the heart into the arteries—the aorta and the pulmonary artery—through the open semilunar valves. The atrioventricular valves are closed at this moment, which helps prevent backflow into the atria, and the heart sound heard is related to valve closure signals at the start of this contraction phase. After the ventricles finish contracting, they relax (diastole), the semilunar valves close, and the cycle begins again with filling of the ventricles.

So this phase specifically describes the ventricles squeezing and ejecting blood into the arteries. Relaxation of the ventricles is diastole; venous return occurs as blood flows back to the heart mainly during diastole; atria contracting to eject blood refers to atrial systole, not ventricular systole.