The primary role of the carbonic acid-bicarbonate buffer system is to:
a. buffer stomach acid
b. buffer carbonic acid formed by carbon dioxide
c. limit pH changes caused by organic and fixed acids
d. buffer the urine
e. increase ventilation
Acids & Bases in Biological Systems:
Biological macromolecules act as acids and bases by donating and accepting protons, respectively. Because most macromolecules contain many functional groups, they can donate or accept multiple protons. These acidic and basic groups serve as weak acids and bases, in which the Ka value determines how much dissociation occurs depending on the local pH. This means that alterations in pH will determine which groups of the macromolecule are protonated and deprotonated, which can alter the properties (and functionality) of the molecule.
Answer and Explanation:
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The primary role of the carbonic acid-bicarbonate buffer system is to (b.) buffer carbonic acid formed by carbon dioxide.
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