Multiple choice

In which form is carbon dioxide mainly carried in the blood?

  1. Bicarbonate ions

  2. Carbaminohemoglobin

  3. In dissolved state

  4. Carbonic acid

  5. Sodium carbonate

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A Correct answer
Explanation

About 70% of the carbon dioxide is transferred in this way. Bicarbonate ions are formed by the dissociation of carbonic acid which is formed by the union of carbon dioxide and water in the presence of carbonic anhydrase enzyme.