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

  1. A
    Helps in releasing more to the epithelium tissues
  2. B
    Acts as a reserve during muscular exercise
  3. C
    Raises the of blood to
  4. D
    Is enough to keep oxyhaemoglobin saturation at

Solution & Step-by-step Explanation

Under normal physiological conditions, oxygenated blood delivers about of per of blood to the tissues. A large portion of (about saturation) remains in the venous blood as a reserve to be used during strenuous physical activity or muscular exercise.

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A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This :
A
Helps in releasing more to the epithelium tissues
B
Acts as a reserve during muscular exercise
C
Raises the of blood to
D
Is enough to keep oxyhaemoglobin saturation at

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