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Question: Answered & Verified by Expert
A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. What is the fate of this O2?
BiologyBreathing and Exchange of GasesNEET
Options:
  • A It raises the pCO2 of blood to 75 mm of Hg.
  • B It is enough to keep oxyhaemoglobin.
  • C It helps in releasing more O2 to the epithelial tissues.
  • D It acts as a reserve during muscular exercises.
Solution:
1245 Upvotes Verified Answer
The correct answer is: It acts as a reserve during muscular exercises.
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.

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