A good interactive explanation of breathing and gas exchange in humans with diagrams to label, animations to watch and questions to answer.
- http://www.schoolscience.co.uk/conte...hma/asth3.html School Science
Although this is of the human respiratory system there is a good diagram that gives the functions of the various parts as you move your mouse over it. Also an animation of gas exchange and a quiz to test your understanding of it.
- http://en.wikipedia.org/wiki/Lung Wikipedia
Wikipedia on the lungs. Lots of good information on the human respiratory system with all sorts of links if you are interested.