CO2 is carried in blood by hemoglobin in the form of
A
Sodium bicarbonate
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B
Potassium bicarbonate
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C
Carbamino compound
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D
Methaemoglobin
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Solution
The correct option is C Carbamino compound
When carbon dioxide binds to hemoglobin, it forms carbaminohaemoglobin molecule. It is one of the form in which CO2 exists in blood. This decreases the affinity of haemoglobin for oxygen. Binding of CO2to haemoglobin is reversible. When it reaches the lungs, the carbon dioxide dissociates from the haemoglobin and is expelled out.