Why does the requirement of oxygen in multicellular organisms not be completed by diffusion?
Answers
This is because most of organisms do not have her highly specialised cells and also most of the organisms do not contact with atmosphere. So their oxygen requirements cannot be fulfilled by diffusion.
Diffusion is unable to meet oxygen requirements of multi-cellular organisms like humans because diffusion is a slow process.
EXPLANATION:
This means that the time taken for oxygen to circulate to all body cells is more.
In addition, humans need a lot of oxygen in their cells and tissues so that the body activities can take place in the right manner and in time.
With diffusion, oxygen can’t diffuse into all body cells in a quick manner because the human body is large and has a large number of cells and tissues.
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