Question : The buffer action of blood is due to the presence of:
Option 1: HCl and NaCl
Option 2: Cl- and CO32-
Option 3: Cl- and HCO-3
Option 4: HCO3- and H2CO3
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Correct Answer: HCO 3 - and H 2 CO 3
Solution : The correct option is HCO 3 - and H 2 CO 3 .
The carbonic acid (H 2 CO 3 ), and bicarbonate anion (HCO 3 - ) buffer system in the blood that maintains a stable pH is crucial for physiological processes. Deviations beyond pH 7.8, or below 6.8 can be life-threatening, highlighting the vital role of this buffer in preventing extreme acidity, or alkalinity that could lead to death.
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