lungs, due to differences in partial pressures across the alveolar-capillary membrane, oxygen diffuses into the blood and carbon dioxide diffuses out. Lungs contain a large surface area to facilitate this gas exchange process.

Tracer, self- and chemical diffusion

Fundamentally, two types of diffusion are distinguished:
* Tracer diffusion and Self-diffusion, which is a spontaneous mixing of molecules taking place in the

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