Heavy Breathing, Pounding Heart, Copious Sweating and Stinky Bathrooms
Why do we breathe?





Look at this respiratory system page that shows how the heart and lungs are connected.

Think of these questions when you are doing your research:


What does breathing have to do with cells?


What is meant by "exchange of gases" or "gaseous exchange"?  What gases are exchanged?


Why do we breath faster when we exercise?