What body system contains the blood vessels and heart?

The circulatory system is responsible for transporting blood throughout the body, and it includes the heart and a network of blood vessels, which encompass arteries, veins, and capillaries. This system's primary functions are to deliver oxygen and nutrients to tissues, remove waste products, and help regulate body temperature and pH levels. The heart acts as the pump that propels blood, while blood vessels serve as the conduits through which blood flows, making the circulatory system crucial for maintaining overall physiological balance and homeostasis in the body.