It'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 body'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. And it does this through an extraordinary collection of blood vessels. Your Blood Stream Your blood travels through a rubbery pipeline with many branches, both big and small. The tubes that carry blood away from your heart are called arteries.