Question

51. A large proportion of oxygen remains unused in the
human blood even after its uptake by the body tissues.
This O2
(a) acts as a reserve during muscular exercise
(b) raises the PCO2 of blood to 75 mm of Hg
(c) is enough to keep oxyhaemoglobin saturation at 96%
(d) helps in releasing more O2 to the epithelial tissues.
In the tissues high concentrations of carbon dioxide

Answer 1

Answer:A - It acts as a reserve during muscular exercise.