A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This oxygen ___________
A. helps in releasing more oxygen to tissues
B. raises the pCO2 of blood to 75mm of Hg
C. acts as a reserve during muscular exercise
D. is enough to keep oxyhemoglobin saturation at 96%
Answer:A
A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This oxygen ___________
A. helps in releasing more oxygen to tissues B. raises the pCO2 of blood to 75mm of Hg C. acts as a reserve during muscular exercise D. is enough to keep oxyhemoglobin saturation at 96%