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What do the lungs do and how do they do it?
What is asthma? Why do people use inhalers?
Where does oxygen go in the body and why do we need it so much?
How do you get air into your lungs? Why do you need a diaphragm?
What can go wrong with the lungs, and why?
A supplement to Follow the Oxygen - how exactly does the mitochondria convert oxygen into energy?
What makes blood red? What else does blood do?
What are the different kinds of pneumonia and how do doctors determine them? See for yourself on real X-rays!