Your lungs are one of the organs in your body that recharges your blood so it can provide nutrients to the cells in your body. Carbon dioxide comes out of the blood and oxygen goes in. A lot of the impurities you breathe in are filtered out by the lungs, too, but their most important function? Getting oxygen into the bloodstream!

Lungs play a crucial role in the cardiovascular system. Humans, like most living things, need oxygen to live. We get the oxygen we need from the air we breathe. When your body uses oxygen it forms carbon dioxide, a waste product that must be removed from your body. When we exhale (breathe out) we are getting rid of carbon dioxide.

How do the lungs make this exchange of gasses? Take a look inside a model of the lungs. It's as easy a breathing in . . .

. . . and out . . .

Quick Menu: Cardio | Intro | Heart | Lungs | Activity 1 | Blood Vessels | Activity 2