Why is diffusion insufficient to meet oxygen requirements of multicellular organisms like humans ?
Answers
Diffusion is unable to meet the oxygen requirements of multi-cellular organisms such as humans because diffusion is one of the slow processes. That is a lot of time is required for oxygen to circulate to all the cells of the body. ... Therefore, through diffusion, it becomes difficult for oxygen to reach all the cells.
hope you it helpful
Explanation:
Exchange of gases occurs through diffusion across the body surface from where it continues inwardly to every cell. However, diffusion is unable to meet the respiratory requirements of individual cells in larged sized multicellular animals like humans. The body is covered by dead cells. The living cells are not in direct contact with external environment. Moreover, air containing intercellular spaces are absent. Therefore, quick diffusion cannot occur as cell to cell diffusion is a slow process. It will take years for oxygen from lungs to reach the toe. Therefore, there is a need for an additional mechanism to fulfill this requirement.