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 tissues 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 environment. Therefore, diffusion cannot meet their oxygen requirements.

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Answer 2

Answer:

Diffusion is a relatively slow process. Also, all our cells are not in contact with the surrounding medium. It will take 3 years for oxygen to get diffused to our toes from our lungs. Thus, humans use specialized mechanisms to meet their oxygen requirements, and not diffusion.

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