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A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissue. This O2

  • Raise the pCO2 of blood 75 mm of Hg.

  • Is enough to keep oxyhaemoglobin

  • helps in releasing more O2 to the epithelial tissues

  • acts as a reserve during muscular exercises

Answer

D.

acts as a reserve during muscular exercises

Our tissue is able to utilise only 25% of O2 carried by the arterial blood. The venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.

Our tissue is able to utilise only 25% of O2 carried by the arterial blood. The venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.