HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sodium bicarbonate
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Potassium bicarbonate
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Carbamino compound
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Methaemoglobin
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Detailed explanation-1: -About 20-25 per cent CO2 is transported in the form of Carbaminohaemoglobin. Hence CO2 combines with Hb to form Carbaminohaemoglobin. So, the correct answer is ‘Carbaminohaemoglobin’.
Detailed explanation-2: -About 5% of carbon dioxide is transported in the blood as carbamino compounds, which are formed from the reaction of carbon dioxide with terminal amino groups of blood proteins.
Detailed explanation-3: -20-25% of carbon dioxide is transported in the form of carbamino-haemoglobin by RBCs, 5-7% of carbon dioxide is transported in the dissolved state and 70% is transported as bicarbonate.
Detailed explanation-4: -Carbon dioxide binds reversibly to the hemoglobin present in the RBCs and forms carboxyhemoglobin, which transports it to the lungs.
Detailed explanation-5: -When carbon dioxide diffuses as a dissolved gas from the tissue capillaries, it binds to the -amino terminus of the globulin chain, forming Carbaminohemoglobin.