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Question: Answered & Verified by Expert
A large proportion of oxygen is left unsused in the human blood even after its uptake by the body tissues. This $\mathrm{O}_2$
BiologyBreathing and Exchange of GasesNEETNEET 2011 (Screening)
Options:
  • 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
  • D acts as a reserve during muscular exercise
Solution:
2383 Upvotes Verified Answer
The correct answer is: acts as a reserve during muscular exercise
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.

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