Why Is Diffusion Insufficient to meet the Oxygen Requirements of Multicellular Organisms Like Humans?

  • In single-celled organisms, no specific organs for exchange of gasses are needed because the entire surface of the organism is in contact with the environment. 
  • Multicellular organisms such as human beings have complex body designs and large body size. Because of that  oxygen cannot diffuse into all the cells of the human body quickly.
  • Therefore, diffusion is insufficient to meet the oxygen requirement of multicellular organisms like humans.
  • Multicellular organisms (Human beings) bear specialized cells and tissues for performing various necessary functions of the body such as intake of food and oxygen, etc.

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