Question

Why diffusion is sufficient to meet the daily requirements of multicellular ogranisms ?

Answer 1

Because diffusion is slower process and due to this process blood diffuses completely in the body from one part to the other part of the body.

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Answer 2

Answer: multicellular organisms used diffusion to meet all requirements of food, exchange of gases or removal of wastes it would take too much of time for carrying even a single particle in the body of the organism and hence diffusion is a process only for unicellular organisms. Diffusion is insufficient to meet the oxygen requirement of multicellular organisms like human because all the cells are not direct contact in environment and diffusion is a slow process. Diffusion is too slow to cover the distance between the gas exchange surface and the sites where the oxygen is required.

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