what is the circulatory system made up of?
Itâs a big name for one of the most important systems in the body. Made up of the heart, blood and blood vessels, the circulatory system is your bodyâs delivery system. Blood moving from the heart, delivers oxygen and nutrients to every part of the body. On the return trip, the blood picks up waste products so that your body can get rid of them. Your Heart. About the size of your clenched fist, your heart is a muscle.