What is the function of the aortic valve?

What is the function of the aortic valve?

• A. It regulates blood flow from the left ventricle into the aorta.
• B. It prevents backflow of blood from the right atrium to the right ventricle.
• C. It prevents backflow of blood from the left ventricle to the left atrium.
• D. It regulates blood flow into the pulmonary artery.

Answer: (A)

The aortic valve’s job is to regulate blood flow from the left ventricle into the aorta while preventing backflow into the ventricle. It opens during systole when the left ventricle pressure exceeds the aorta’s, allowing blood to be ejected into the systemic circulation. It then closes in diastole to stop blood from flowing back into the ventricle as the ventricle relaxes. This is different from the valves that prevent backflow between the right atrium and right ventricle, or between the left atrium and left ventricle, and from the valve that controls flow into the pulmonary artery.

The aortic valve’s job is to regulate blood flow from the left ventricle into the aorta while preventing backflow into the ventricle. It opens during systole when the left ventricle pressure exceeds the aorta’s, allowing blood to be ejected into the systemic circulation. It then closes in diastole to stop blood from flowing back into the ventricle as the ventricle relaxes. This is different from the valves that prevent backflow between the right atrium and right ventricle, or between the left atrium and left ventricle, and from the valve that controls flow into the pulmonary artery.