Question:
How does the Hb act as buffer?
How does the Hb act as buffer?
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Haemoglobin takes up hydrogen ions released from carbonic acid and so keeps the blood pH nearly constant.
Updated On: Nov 13, 2026
By forming \(\mathrm{HbCO}_{2}\)
By forming HHb
By forming \(\mathrm{NaHCO}_{3}\)
By forming \(\mathrm{HbO}_{2}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
In red blood cells, \(\text{CO}_2\) forms carbonic acid, which dissociates into \(\text{H}^{+}\) and \(\text{HCO}_3^{-}\).
Step 2: Buffering
The \(\text{H}^{+}\) ions are taken up by haemoglobin to form reduced haemoglobin, written HHb.
Step 3: Result
Removal of free \(\text{H}^{+}\) prevents a fall in pH, so Hb acts as a buffer by forming HHb.
Final Answer:
Haemoglobin buffers the blood by forming HHb. \[ \boxed{\text{(B) }\text{By forming HHb}} \]
In red blood cells, \(\text{CO}_2\) forms carbonic acid, which dissociates into \(\text{H}^{+}\) and \(\text{HCO}_3^{-}\).
Step 2: Buffering
The \(\text{H}^{+}\) ions are taken up by haemoglobin to form reduced haemoglobin, written HHb.
Step 3: Result
Removal of free \(\text{H}^{+}\) prevents a fall in pH, so Hb acts as a buffer by forming HHb.
Final Answer:
Haemoglobin buffers the blood by forming HHb. \[ \boxed{\text{(B) }\text{By forming HHb}} \]
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