How does the circulatory system perform its functions?

The circulatory system performs its functions by using a network of the heart, blood vessels, and blood to transport essential substances throughout the body. The heart pumps oxygen-rich blood from the lungs to the tissues and organs, while blood vessels, including arteries and veins, facilitate this flow. It also carries nutrients, hormones, and waste products, maintaining homeostasis and supporting cellular functions. Additionally, the circulatory system plays a crucial role in immune response and temperature regulation.