Bulk of carbon dioxide (CO₂) released form body tissues into the blood is present as

Options

(a) bicarbonate in blood plasma and RBCs
(b) free CO₂ in blood plasma
(c) 70% carbamino – haemoglobin and 30% as bicarbonate
(d) carbamino – haemoglobin in RBCs

Correct Answer:

bicarbonate in blood plasma and RBCs

Explanation:

70% to 75% CO₂ is transported as primary buffer of the blood. Bicarbonate ion (HNO₃) in blood plasma. When CO₂ diffuses from tissues into blood then it is acted upon by the enzyme carbonic anhydrase.