As the heart relaxes, pressure in the ventricle drops below that of the aorta. The back-pressure of the blood in the aorta pushes the leaflets together to form a tight seal, creating the second heart sound (the "dub" in "lub-dub"). Common Conditions and Diseases
The valve operates based on pressure differentials between the heart and the body. aortic valve
Aortic Valve: Function, Location & Anatomy - Cleveland Clinic As the heart relaxes, pressure in the ventricle
The aortic valve is one of the four main valves in the human heart, serving as the final "gatekeeper" that regulates blood flow from the left ventricle into the aorta . Its primary function is to ensure that oxygen-rich blood moves in a single direction—out to the rest of the body—while preventing any backflow into the heart. Anatomy and Structure Aortic Valve: Function, Location & Anatomy - Cleveland
Directly behind each cusp are elliptical depressions in the aortic wall that house the openings ( ostia ) to the coronary arteries, ensuring the heart muscle receives its own blood supply during diastole. Function in the Cardiac Cycle