Which of the following correctly describes mechanisms of carbon dioxide transport?

Question

A. The chloride shift mechanism enhances CO-2 transport.

B. Carbonic anhydrase is responsible for bonding CO-2 to hemoglobin.

C. 20% of CO-2 is dissolved directly into the plasma.

D. 7-8% of CO-2 is carried in the form of carbaminohemoglobin.

Answer 1

A- true.  

b. false, carbonic anhydrase catalyzes the rxn CO2 + H2O <--> H2CO3 <---> HCO3-  + H+.  very little CO2 binds to Hb and it does is without carbonic anhydrase.

c. No, about 90% of CO2 is in the form of bicarbonate (HCO3-) in the cell.  20% is way too big

d. False.  very little CO2 is carried as carbaminoHb