The majority of the acid the body produces in a day is excreted through the lungs as CO2. What happens to the H+ ions?
a. They are bound to Hb.
b. They bind to phosphate.
c. They form carbamino compounds.
d. They bind to an OH-forming H2O.
ANS: D
The CO2 excretion of the lungs does not actually remove H+ ions from the body. Instead, the chemical reaction that breaks down H2CO3 to form CO2 binds H+ ions in the harmless water molecule:
H+ + HCO3– H2CO3 H2O + CO2
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