Explain two roles of diffusion in human beings.

Answer:

- Absorption of digested foods such as glucose, amino acids in the ileum into the blood stream.
- Exchange of gases across the alveolus e.g #CO_2#/#O_2# diffuse from
capillaries to the blood.
- Excretion of nitrogenous wastes from cells e.g urea from the blood capillaries into elimination sites.

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