Which of the following acts as hemoglobin (Hb) in the blood buffer system?
Show Hint
NaHCO₃
H₂Hb
HbCO₂
- HbCl
The Correct Option is B
Solution and Explanation
The correct answer is H₂Hb, which refers to deoxygenated hemoglobin.
Deoxygenated hemoglobin (H₂Hb) acts as a buffer in the blood buffer system by binding to hydrogen ions (H+) and helping to stabilize the pH of the blood. This occurs because when hemoglobin releases oxygen, it has a higher affinity for hydrogen ions, which allows it to function as a buffer in the tissues, where CO2 is produced during cellular respiration.
In the lungs, when hemoglobin picks up oxygen (forming HbO2), it releases the hydrogen ions, and the pH of the blood is regulated. This dynamic exchange of oxygen and hydrogen ions helps maintain the acid-base balance in the blood, which is essential for proper physiological function.
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