Q158 / 200 · NEET 2011 (Screening) · Zoology

A large proportion of oxygen is left unsused in the human blood even after its uptake by the body tissues. This $\mathrm{O}_2$

  • A
    raises the $p_{\mathrm{CO}_2}$ of blood to $75 \mathrm{~mm}$ of $\mathrm{Hg}$
  • B
    is enough to keep oxyhaemoglobin
  • C
    helps in relasing more $\mathrm{O}_2$ to the epithelial tissues
  • Correct answer
    D
    acts as a reserve during muscular exercise

Solution

Our tissue are able to utilize only $25 \%$ of $\mathrm{O}_2$ carried by arterial blood. The venous blood is still $75 \%$ saturated with $\mathrm{O}_2$. This $\mathrm{O}_2$ acts as a reserve during muscular exercise.

Hence, the correct answer is option: 'D'.

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