What 4 main parts of the body make up the circularotory system?

The circulatory system primarily consists of the heart, blood, blood vessels, and lungs. The heart pumps blood throughout the body, while blood carries oxygen, nutrients, and waste products. Blood vessels, including arteries, veins, and capillaries, transport blood to and from the heart and various tissues. The lungs facilitate the exchange of oxygen and carbon dioxide, playing a crucial role in the system's overall function.