The Human Heart
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Your heart is a pump. The right side of your heart receives blood from your body and pumps it into your lungs. The left side of your heart receives blood from your lungs and pumps it into your body. Your heart is about the size of your fist. Your heart is made of muscles and it constantly pumps blood through your body every minute of the day. It pumps blood and the movement is called involuntary because you don't have to think about it and it does it anyway. most people believe the heart is on the left side of your body, but they are wrong, your heart is actually in the middle of your chest between your lungs. It is protected by your ribs.
The circulatory system is responsible for carrying your blood away from and back to the heart. It is made up of blood vessels, arteries, and veins that carry blood around your body. The circulatory system carries oxygen, nutrients and hormones to cells. It also removes waste products like carbon dioxide.