<human>:  What is the relationship between the human heart and the cardiovascular system?
<bot>: The human heart is an integral part of the cardiovascular system, as it is responsible for pumping oxygen-rich blood throughout the body. This oxygen-rich blood carries essential nutrients and hormones to every cell and helps to remove waste products from the tissue. The heart works together with the network of vessels called arteries, veins, and capillaries to form a complete circulatory system, which is responsible for supplying blood to all parts of the body.