Check sibling questions

Why is diffusion insufficient to meet the oxygen requirements of multi - cellular organisms like humans?

Answer

  • Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration.
  • Diffusion occurs in multicellular organisms too, although it takes place on a cellular level .
  • Diffusion is a slow process. So, it will take a longer time over a much larger distance for oxygen to reach every cell of the body.
  • The volume of the human body is so large that oxygen cannot diffuse into all the cells in time to keep up with our metabolic needs.
  • Hence, diffusion is insufficient to meet the oxygen requirements of large multicellular organisms.

 

Exchange of gases at alveoli - Teachoo.jpg

CA Maninder Singh's photo - Co-founder, Teachoo

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo