Arteries are the blood vessels that emanate from the heart to the capillaries throughout the body and to the capillaries within the lung tissue. In contrast to veins, arteries are characterized by thin lumen, elasticity and high pressure. The blood flowing in the arteries is pumped from the heart and exchanged without the capillaries of the body and capillaries of the lung tissue. The arteries of the heart can be divided into two categories: 1. arteries connected to the left ventricle and arteries connected to the right ventricle. The blood in the arteries connected to the left ventricle is oxygenated blood that has been exchanged with gas in the capillaries of the lungs, so this blood has a high oxygen content, bright red color, etc. This blood has to go to the tissues and organs of the whole body for material and gas exchange. 2. The blood in the arteries connected to the right ventricle is venous blood that has been exchanged with gas in the capillaries of the whole body, so this blood has a low oxygen content, dark red color, etc. This blood has a low oxygen content, dark red color, etc, These bloods need to go to the lungs for re-oxygenation and gas exchange.