alleryStart learning →Which statement captures the Haldane effect?
ADeoxygenated haemoglobin binds carbon dioxide readily
BOxygenated haemoglobin binds carbon dioxide readily
CAcid pH makes haemoglobin bind carbon dioxide more
DWarm blood makes haemoglobin bind oxygen more tightly
Answer & Solution
Correct answer: A. Deoxygenated haemoglobin binds carbon dioxide readily
1. The Haldane effect concerns oxygen status and the affinity of haemoglobin for carbon dioxide.
2. Haemoglobin saturated with oxygen does not readily bind carbon dioxide.
3. When oxygen is not bound and the oxygen partial pressure is low, haemoglobin binds carbon dioxide readily.
4. So deoxygenated haemoglobin is the better carrier of carbon dioxide, which suits the tissues where unloading of oxygen has just occurred.
5. The second option states the exact reverse and is the standard trap.
6. The third option describes a pH relationship, which belongs to the Bohr effect rather than the Haldane effect.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.5 Transport of Gases_
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