Question

why is diffusion insufficient to meet the oxygen requirements of multicellar organisms like humans

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Answer 1

Answer:

Diffusion is insufficient to meet the oxygen requirement of multicellular organisms like humans because in the multicellular organisms all the cells are not in direct contact with the surrounding environment.

Also, 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.Therefore, the diffusion is insufficient to meet the oxygen requirement in them . Instead , they need specialised cell organs for breathing and exchange of gases .

Hope it helps.

Answer 2

Answer:

The process of diffusion for carrying 02 to all parts of the body is not sufficient for larger multicellular organisms like human beings. Hence, respiratory pigment hemoglobin takes up oxygen from the air and carry it to all the parts of our body through blood.