Which is true?
A. `H^(+)` ions released from carbonic acid combine with haemoglobin to form haemoglobinic acid
B. oxyhamoglobin of ertyhrocytes is alkaline
C. more than 70% of carbon diodxide is trnsferred form tissure to lungs as carbam in to compunds
D. in healthy person haemglobin cont ent is more thant `25g / 100` ml
