What During the systole phase of cardiac cycle left ventricle contracts and blood is pumped into aorta. Which these valves prevents a backflow atrium aortic valve?

During the systole phase of the cardiac cycle, the left ventricle contracts and pumps blood into the aorta. To prevent a backflow of blood into the atrium, the aortic valve closes. The aortic valve is located between the left ventricle and the aorta, and it consists of three cusps or leaflets that are held in place by chordae tendineae. When the left ventricle contracts, the pressure inside the ventricle increases and the aortic valve opens, allowing blood to flow into the aorta. As the left ventricle relaxes during diastole, the pressure inside the ventricle decreases and the aortic valve closes, preventing blood from flowing back into the atrium.