The circulatory system is human body’s transport system. The system consists of the heart, blood vessels and lymphatics. The circulatory system is responsible for:
(a) Transport of nutrients and oxygen to the cells;
(b) Transport of carbon dioxide and other waste products of cellular respiration; and
(c) Circulation of hormones and chemical components and maintenance of the body temperature. The heart is the central organ of the circulatory system; it pumps blood throughout the body. The heart is connected with blood vessels. These are tube-like organs that carry the blood. The third component of this system is the lymphatics that collect and filter the blood.
