<human>:  How does the cardiovascular system work?
<bot>: The cardiovascular system is a network of organs and vessels that is responsible for circulating blood, oxygen, and other nutrients throughout the body. It consists of the heart, blood vessels, veins, and arteries. It works by pumping blood out of the heart and through the arteries, which deliver oxygen and nutrients to the body's cells. The veins then carry the deoxygenated blood back to the heart.