Functions of Human Blood Circulatory System (cardiovascular system):

It transports nutrients, gases, hormones, and wastes to and from cells, helps fight diseases, and helps stabilize body temperature and pH to maintain homeostasis. Like other vertebrates, humans have a closed blood circulatory system (meaning that the blood never leaves the network of arteries, veins, and capillaries). The main components of the human blood circulatory system are the blood, the heart, and the blood vessels.