Bulk of carbon dioxide released from body tissues into the blood is present as
A
bicarbonate in blood plasma and RBCs
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B
free CO2 in blood plasma
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C
70% carbamino-haemoglobin and 30% as bicarbonate
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D
carbamino-haemoglobin in RBCs
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Solution
The correct option is A bicarbonate in blood plasma and RBCs Nearly 70% of carbon dioxide is carried by the blood as bicarbonate, 20-25% as bound to RBCs, and around 7% in a dissolved state through plasma.