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Lung

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Lung (PSF).png

The lung is an organ that allows to breath in the air. Humans, and other animals, have two lungs, but many other animals (such as the snail, or the slug, for example) have only one. Lungs look like some kind of bag, inside the body, that fill and empty with air. Dioxygen-rich air is bourght to the lungs, where the blood takes it, and distribute it to the body. In return, the blood brings carbon dioxyde that is led to the lung, so that ot throws it out of the body.