The large arteries, also known as elastic receptor vessels and elastic arteries, include the aorta, common carotid artery, subclavian artery, and common skeletal artery and the largest branches emanating from them. The projection of each vessel on the body surface varies, and some of them cannot be touched on the body surface, while some of the arteries of the body circulation can be touched on the body surface with arterial pulsations. For example, the common carotid artery and the common femoral artery can be palpated on the surface of the body, and in a thin person, the pulsation of the abdominal aorta can be palpated on the left side of the umbilicus in the abdomen. The aorta is displaced at the height of the 2nd thoracic rib joint on the right side into the aortic arch, after which the ascending aorta gives off the left and right coronary arteries. The external carotid artery is at the superior border of the thyroid cartilage and the inferior border of the common carotid artery. The subclavian artery usually travels below the clavicle. At the inferior border of the 4th thoracic vertebra is the descending aorta, with branches including the cephalic trunk, the left common carotid artery, and the left subclavian artery. The descending aorta divides into two branches, the thoracic aorta and the abdominal aorta, at the height of the 12th thoracic vertebra, and the abdominal aorta divides into the left and right common iliac arteries at the lower edge of the 4th lumbar vertebra. The aorta is composed mainly of elastic fibers, so it has greater elasticity. After the heart ejects blood, some of the blood is transported to various organs, while the blood remaining in the great vessels can push the blood forward and maintain the flow and circulation of blood in the vessels during the period when the heart does not eject blood (diastolic period) due to the reserve and contraction function of the vessels. If lesions occur in the aorta, which usually have a greater impact and weakened elasticity, the function of pushing blood forward during the diastolic period will be weakened. Therefore, you should avoid eating a diet high in cholesterol and fat in your daily life, and you should also exercise properly to eliminate excess energy in your body in order to reduce and decrease the chance of atherosclerosis and avoid affecting the contractile function of your arteries.