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About 30% of CO $_{2}$ is transported as
Carbamino compounds
Bicarbonates of Na and K
Carboxyhaemoglobin
Oxyhaemoglobin

A

Carbamino compounds

B

Carboxyhaemoglobin

C

Bicarbonates of Na and K

D

Oxyhaemoglobin

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Solution

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Carbon dioxide can bind to plasma proteins or can enter red blood cells and bind to hemoglobin. This form transports about 10 percent of the carbon dioxide. When carbon dioxide binds to hemoglobin, a molecule called carbaminohemoglobin is formed. Binding of carbon dioxide to hemoglobin is reversible. Therefore, when it reaches the lungs, the carbon dioxide can freely dissociate from the hemoglobin and be expelled from the body. About 30% of CO $_{2}$ is transported as carbamino haemoglobin.
Therefore, the correct answer is option A.

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