Final answer:
The major functions of the circulatory system include transporting needed substances to cells, picking up waste products, maintaining homeostasis, and protection.
Step-by-step explanation:
The major functions of the circulatory system include:
Transporting needed substances: The circulatory system transports oxygen and nutrients to the cells of the body. This is done through the systemic circulation, where blood is circulated throughout the body, and the pulmonary circulation, where blood is oxygenated in the lungs.
Picking up waste products: The circulatory system also picks up waste products, such as carbon dioxide, from the cells and transports them to the lungs and kidneys for elimination.
Maintaining homeostasis: The circulatory system helps maintain the balance of temperature, pH, and fluid volume in the body.
Protection: The circulatory system plays a role in immune responses, as it transports white blood cells and antibodies to fight against infections and diseases.