The cardiovascular system is composed of the heart, blood vessels, and blood that runs through them. The principal function of the heart is to pump the blood through the system of blood vessels (vascular system). The vascular system is divided into veins and arteries, with the former carrying the blood towards the heart and the latter carrying the blood from the heart to the tissues. The blood transports gases, nutrients, electrolytes, wastes, and hormones maintaining homeostasis in the body. Th

Heart and Circulatory System - How They Work