Lungs
If you worked as a coal miner on the olden days most of them got lung disease. This was caused by them breathing in so much dust. This then damaged the lung tissue. If the lung tissue gets damaged it gets smaller. This then means that you can breath in less oxygen.
Smoking also does this as the tabacco irritaes their air passages. Coughing also damages the delicate tissue.
The gas exchange that takes place in the lungs is where the oxygen that you have just breathed in diffuses into the blood and the waste CO2 passes from your blood and out into the air. This is called gas exchange. Inside the lungs there are millions of air sacs called alveoli. The walls of the alveoli are only one cell thick. The large number of caplilaries around the alveoli give the lungs there pinky colour. Blood carries oxygen away from the alveoli continously to supply the body cells. It also brings waste CO2 to the alveoli. This prevents CO2 building up in your blood and poisining you.
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