The purpose of the circulatory system is to carry blood throughout the body to carry to the organs and other areas of the body that need it, and to carry gaseous wastes to the respiratory system so that is can get rid of them. The ventricle receives blood from the atrium and the ventricles pumps blood to the artery. Arteries carry the blood away from the heart. Since it carries red blood cell, you can oxygen throughout your whole entire body. The parts of the circulatory system have parts of it including the arteries, veins, capillaries, ventricles, atrium, and the mitral valve. Arteries are any of the muscular-walled tubes forming part of the circulation system by which blood and an important route in a system of roads, rivers, or railroad lines: "the east-west artery". The narrow arteries are called veins. Veins are any of the tubes forming part of blood circulation system of the body, carrying mainly oxygen-depleted blood toward the heart.