Circulatory System
Topic(s):   Human Body

Your heart, blood, veins, arteries, and capillaries make up the circulatory system. The job of the circulatory system is to circulate, or move, blood through your body. Your heart squeezes and pumps the blood all over your body. Your heart is about the size of your clenched fist.

The blood carries oxygen to all the parts of your body by going through little tubes called blood vessels. There are three types of blood vessels. The first type is called an artery. It carries blood away from the heart. The second type is called a vein. It carries blood back to the heart. The third type is called a capillary. It carries blood between veins and arteries. It is the smallest blood vessel. Capillaries take oxygen and nutrients to all parts of the body.

If you strung together all of your blood vessels end to end, they could go around the world two times!

Citation information

APA Style: Circulatory System. (2012, July). Retrieved from Facts4Me at

MLA Style: "Circulatory System." Facts4Me. Jul. 2012.

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