Question

Why is diffusion insufficient to meet the oxygen requirement in multicellular organisms like human human?

Answer 1

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$\huge\underline{Answer:}$

In multicellular organisms such as man, the volume of the human body is big and hence, oxygen cannot diffuse into all the cells of the human body quickly. ... Hence, diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans

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Answer 2

Explanation:

The oxygen requirements of an animal cannot be met by the process of diffusion as diffusion is a very slow process. ... This helps for the higher animals like humans to meet the sufficient oxygen requirement. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment.