Question

why is diffusion insufficient to meet the oxygen requirement of multicellular organisms like humans ​

Answer 1

Answer:

In multi-cellular organisms like humans, all the cells may not be in direct contact with the surrounding environment. Thus diffusion is  insufficient to meet the oxygen requirement of multi-cellular organisms like humans .

          It has been estimated that a period of 3 years would be need to carry a molecule of O₂ from our lungs to our toes, if diffusion were to move O₂ in our body.

If this helps you, please mark as Brainliest...

: )

Answer 2

Answer:

• Cells in multicellular organisms are not in direct contact with the environment.

• So, diffusion is insufficient to meet the oxygen requirements in multicellular organisms.

• Whereas, single celled organisms like amoeba has whole body in the direct contact in the environment.

• This is why oxygen requirements in unicellular organisms is fulfilled sufficiently.

• Humans also under multicellular organisms, this is why they need organs like lungs to satisfy their oxygen requirements.

• Similarly, fishes have gills to satisfy their oxygen requirements.