The lungs
by MagicBox Animation

“When You Breathe (Lungs)” by StoryBots
How the lungs take in oxygen to be carried all over your body.

What do the lungs do? by TED-Ed
Lesson by Emma Bryce | Animation by Andrew Zimbelman

When you breathe, you transport oxygen to the body’s cells to keep them working, while also clearing your system of the carbon dioxide that this work generates.