Our tissue are able to utilize only 25% of O2 carried by arterial blood. The venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.
NEET UG 2011 — Zoology Breathing and Exchange of Gases
A large proportion of oxygen is left unsused in the human blood even after its uptake by the body tissues. This O2
Held on 30 Apr 2011 · Verified 9 Jul 2026.
raises the pCO2 of blood to 75 mm of Hg
is enough to keep oxyhaemoglobin
helps in relasing more O2 to the epithelial tissues
acts as a reserve during muscular exercise
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Work through every NEET UG Breathing and Exchange of Gases PYQ, year by year.