The circulatory system is made up of your heart, blood, and blood vessels. This system delivers oxygen and nutrients to all parts of your body as the blood moves from your heart. It also picks up waste products in your blood so your body can get rid of them.
Your heart is a muscle that works to circulate the blood in your body. It is about the size of a closed fist and it beats over 70 times a minute when your body is at rest. The heart moves the blood through a series a blood vessels throughout your body.