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

is enough to keep oxyhemoglobin saturation at 96%

helps in releasing more oxygen to tissues

raises the pCO2 of blood to 75mm of Hg

acts as a reserve during muscular exercise

A large proportion of oxygen is left unused in the human blood even af

1.	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 pCO<sub>2</sub> of blood to 75mm of Hg
C.	acts as a reserve during muscular exercise
D.	is enough to keep oxyhemoglobin saturation at 96%
Answer» D. is enough to keep oxyhemoglobin saturation at 96%