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Q97
(CAPF/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Which one of the following effects best explains the high partial pressure of carbon dioxide causing haemoglobin to release oxygen in actively respiring tissues?
Result
Your answer:
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·
Correct:
C
Explanation
The Bohr effect is a physiological phenomenon where an increase in the partial pressure of carbon dioxide (PCO2) or a decrease in blood pH (increased acidity) leads to a decrease in haemoglobin's affinity for oxygen. In actively respiring tissues, metabolism produces high levels of CO2, which reacts with water to form carbonic acid, lowering the pH. This environment promotes the release of oxygen from oxyhaemoglobin to the tissues where it is needed most.
- Haldane effect: Describes how oxygen concentrations determine haemoglobin's affinity for carbon dioxide (oxygenation in lungs promotes CO2 release).
- Allee effect: A concept in ecology relating population density to individual fitness.
- Eagle effect: A microbiological phenomenon where high antibiotic concentrations are less effective against bacteria than lower doses.
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