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Respiration

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Question

The percentage of CO $_{2}$ which combines with water molecules of the blood and is carried in the form of carbonic acid is

A

10%

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B

30%

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C

50%

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D

70%

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Solution

The correct option is A 10%
Blood is the medium of transport for oxygen and carbon dioxide. About 97% of oxygen is transported by RBCs in the blood. The remaining 3% of oxygen is carried in a dissolved state through the plasma. Nearly 20-25% of carbon dioxide is transported by RBCs whereas 70% of it is carried as bicarbonate ions. About 7% of carbon dioxide is carried in a dissolved state through plasma. 10% of the carbon dioxide is carried in form of carbonic acid.

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({C O}_{2})

combines with water

(H_{2} O)

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H_{2} O + {C O}_{2} ⟶ H_{2} {C O}_{3}

Carbonic acid undergoes dissociation as,

H_{2} {C O}_{3} ⇌ H^{+} + H {C O}_{3}^{-}

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