Question 1

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


Diffusion is a slow process and is insufficient to meet the requirements of the multi- cellular organisms like humans. Human beings are the multi- cellular organisms and have complex body structures. All the body cells do not contain direct contact with the environment, so they need the oxygen and oxygen requirement cannot fulfil by the diffusion process.

So, in the multi- cellular organisms like human beings they have special types of tissues and the organs which helps them to meet the oxygen requirement of the body.

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