Q. Bulk of carbon dioxide (CO₂) released from body tissues into the blood is present as
A) 70% carbamino-haemoglobin and 30% as bicarbonate
B) Carbamino-haemoglobin in RBCs
C) Bicarbonate in blood plasma and RBCs
D) Free CO₂ in blood plasma
Explanation
[Solution from source] About 70% of CO₂ is carried as bicarbonate, formed mainly in RBCs by carbonic anhydrase and carried largely in plasma; about 20-25% travels as carbamino-haemoglobin and about 7% as dissolved CO₂. The trap reverses the percentages: carbamino-haemoglobin is the minor form, not 70%. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.