Diagram of the human heart (cropped)

The aortic valve, roughly just to the right of center, via Wikipedia

The aortic valve is a heart valve that joins the left ventricle of the heart to the aorta. In most individuals, it has three distinct leaflets.

Aortic valve stenosis is a condition where the valve fails to allow enough blood to flow through it, robbing the body of oxygen. It has several common causes.

Aortic valve regurgiation is a condition where the valve fails to shut completely when the left ventricle is at rest, allowing blood to flow back into the ventricle. It is most commonly caused by an infection, but has other causes as well.

Aortic valve at Wikipedia

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