Answer: The circulatory system or cardiovascular system
Explanation: The circulatory system allows the blood to circulate and permits oxygen, carbon dioxide, nutrients, hormones and blood from and to the cells in the body. The system consist of heart, blood and blood vessels. There are five types of blood vessels: the arterioles; the capillaries; here exchange of chemical and water takes place between blood and tissues; the arteries; it carries blood away from the heart; the venules; and the veins, which carries blood from the capillaries back to the heart.