Hemoglobin has highest affinity for O2 when
Correct answer: C. pH is high
- A. pH is low
- B. CO2 is high
- C. pH is high
- D. Temperature is high
Explanation
Hemoglobin has highest O2 affinity at high pH, low CO2, and low temperature (in the lungs).
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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