$A$ large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This $O_2$

  • A
    Acts as a reserve during muscular exercise
  • B
    Raise the $pCO_2$ of blood to $75 \,mm \,Hg.$
  • C
    is enough to keep oxyhaemoglobin saturation at $96\%$
  • D
    Helps in releasing more $O_2$ to the epithelial tissues

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