Question

1. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

Answer 1

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.

Answer 2

In diffusion, the gas is passed right through the organisms body surface but in multicellular organisms like humans this is not sufficient as the time that would take for the Oxygen to reach the lungs would be too much and the animal would suffocate due to lack of oxygen.
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