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15 cards from this deck
In the thorax (upper body), protected by ribcage
Supply oxygen to blood and remove carbon dioxide
Windpipe
Ventilate the lungs by moving the ribcage during breathing
Two
In the alveoli (small air sacs)
Moves down
Moves up and out
Lower pressure
Moves down and in
Diffuses down its concentration gradient
To maximise diffusion
Creates short diffusion pathway, speeding up gas exchange
Number of breaths divided by number of minutes
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