The circulatory system is responsible for distributing oxygen and nutrients throughout the body.

Here's how it works:

* Heart: The heart pumps blood throughout the body.

* Blood vessels: Blood vessels, including arteries, veins, and capillaries, carry the blood.

* Blood: Blood carries oxygen, nutrients, hormones, and other important substances.

Oxygen is picked up by the blood in the lungs and transported to the body's cells. Nutrients are absorbed from the digestive system into the blood and then delivered to the cells.

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