Question

Why is diffusion insufficient to the meet the the oxygen requirements of muticellular organisms like humans ?

Answer 1

Answer:

Explanation:

In multicellular organisms like humans, all the body cells are not in direct contact with the surronding environment. Therefore, every cell of the body will not get oxygen as per need by diffusion from the environment . Therefore, diffusion is insufficient to meet the oxygen requirements of multicellular  organisms like humans

Answer 2

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. Diffusion, being a slow process will take a lot of time to circulate oxygen to all the body cells. Hence, diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans.