Biology 3 - 13.1 - Gas Exchanges

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 Dissolved substance move by active transport, diffusion and osmosisMany human organs are specialised for gas exchanges such as the villi in the small intestine and the alveoli in the lungs both increase the surface area.

 They both have extensive networks of capillaries so that oxygen and carbon dioxide can pass out of the blood quicker

 The villi absorb the soluble products of digestion through active transport and


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