Discussion
Carbon dioxide formed in the tissue oxidation is transported through blood as ................. .
Answer: A
The key's answer is Carbonic acid.
Carbon dioxide from the tissues diffuses into the blood. Most of it enters the red blood cells, where the enzyme carbonic anhydrase combines it with water to form carbonic acid, which dissociates into hydrogen ions and bicarbonate. About 70% of carbon dioxide is carried this way; the rest travels dissolved in plasma or bound to haemoglobin as carbaminohaemoglobin.
Lactic acid is a product of anaerobic glycolysis, not a carrier of CO2. Oxyhaemoglobin carries oxygen, and carboxyhaemoglobin is haemoglobin bound to carbon monoxide, not carbon dioxide.
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