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← Theoretical 1

Q28 — Carbon Dioxide Transport in the Blood

Theoretical 1 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Respiratory Physiology

The diagram shows the mechanism of transport of carbon dioxide in the blood.

Diagram of the bicarbonate pathway for CO2 transport in red blood cells, showing carbonic anhydrase and haemoglobin. Mechanism of CO₂ transport in the blood, centered on the red blood cell’s bicarbonate-buffering pathway and haemoglobin.

Using the information and figure, determine whether the following statements are true or false:

A. The presented scheme is the only way to transport carbon dioxide via circulatory system to the lungs.
B. Substances 1 and 2 are found in red blood cells.
C. Substance 1 is the enzyme carbonic anhydrase.
D. Substance 5 is carbaminohemoglobin.
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Question reproduced from IBO 2022, Theoretical Paper 1, licensed under CC BY-NC-SA 4.0 — attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)