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James Alberts
Biology ­ Gas Exchange

Diffusion is required to supply oxygen to all organisms; the efficiency of diffusion is increased if there is;

1. A large surface area ­ In which exchange of molecules can take place
2. A concentration gradient ­ In which the principle of diffusion works…

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1. External intercostals muscles relax
2. Ribs move down and inwards
3. Thorax decreases in both measurement ways
4. Diaphragm relaxes and moves up

From these stages the volume of the thorax has decreased, which means pressure between the pleural
surfaces increases, air pressure is more than atmospheric pressure, which…


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