The cardiovascular system, also known as the circulatory system, is responsible for transporting blood throughout the body. It consists of the heart, blood vessels, and blood. The heart pumps oxygen-rich blood from the lungs to the rest of the body, while returning oxygen-poor blood back to the lungs for reoxygenation. Blood vessels include arteries, veins, and capillaries. Arteries carry blood away from the heart, veins return blood to the heart, and capillaries facilitate the exchange of oxygen, nutrients, and waste between blood and tissues. This system plays a crucial role in maintaining overall health and supporting bodily functions.