Arteries are blood vessels within the body that provide oxygen-rich blood to the tissues in the body, as defined by WebMD. The arteries are able to deliver this oxygen due to the pumping mechanism of the heart.
Each artery has three different layers: the intima, the media and the adventitia. The largest artery found in the body is the aorta, which is the artery that extends from the left ventricle of the heart. Patients with medical conditions related to their arteries often have conditions such as atherosclerosis, which is the buildup of cholesterol within the arteries, or stenosis of the arteries, which is the narrowing of the arteries. Both of these can lead to more severe conditions, such as strokes and heart attacks, as noted by WebMD.