Which of the following steps is $NOT$ involved in the process of respiration?

  • A
    Diffusion of gases across the alveolar membrane.
  • B
    Transport of gases by the blood.
  • C
    Utilization of $O_2$ by the cells for catabolic reactions and resultant release of $CO_2$.
  • D
    Provision of nutrition and $O_2$ to all living cells of the body.

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