Why is diffusion insufficient to meet the oxygen requirements?
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Answer:
All the body cells are not in direct contact with the environment so diffusion would take a lot of time to happen . It has been estimated that it would take three years to diffuse one molecule of oxygen from toes to lungs.
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In multicellular organisms like humans, all the body cells are not in direct contact with the surrounding environment . Thus , every cell of the body will not get oxygen as by the process of diffusion from the environment .
Therefore diffusion is insufficient to meet
the oxygen requirements of multicellular
organisms .
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