Question

Why is diffusion insufficient to meet the oxygen requirements of multi cellular organisms like humans?​

Answer 1

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Multicellular organisms such as humans possess complex body designs. They have specialised cells and tissue for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms,multicellular cells are not in direct contact with the outside environments. Therefore,diffusion cannot meet their oxygen requirements.

Answer 2

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Diffusion is unable to meet the oxygen requirements of multi-cellular organisms such as humans because diffusion is one of the slow processes. That is a lot of time is required for oxygen to circulate to all the cells of the body. Besides, in humans oxygen requirement is more at cellular and tissue level.