Biology Question- Actions of buffer in response to pH decrease in blood?

Question

One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3) Carbonic acid is a weak acid that dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+)

If the pH of the blood drops, one would expect

a. a decrease in the concentration of H2CO3 and an

increase in the concentration of HCO3

b. the concentration of hydroxide ion (OH-) to increase

c. the concentration of bicarbonate ion (HCO3-) to increase

d. the HCO3- to act as a base and remove excess H+ with

the formation of H2CO3

e. the HCO3- to act as an acid and remove excess H+ with

the formation if H2CO3

Answer 1

d. the HCO3- to act as a base and remove excess H+ with

the formation of H2CO3

Answer 2

D is the answer since the excess H+ would react with HCO3-1 to produce H2CO3 which is an unstable acid and decomposes to CO2 and H2O..this is the source of CO2 in blood gas profiles ans is expired at Lung level as part of the svavenging of H+s by HCO3-1 in the deoxy hemoglobin to oxy hemoglobin transition characteristic of the Bohr Effect