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Anoxia, observed in high-altitude climbers, is best explained by:
AExcessive CO₂ at altitude
BLow temperature reducing haemoglobin function
CHigh humidity
DLow partial pressure of O₂ at altitude → low O₂ solubility in blood → poor oxygenation
Answer & Solution
Correct answer: D. Low partial pressure of O₂ at altitude → low O₂ solubility in blood → poor oxygenation
At altitude, **atmospheric pressure (and thus pO₂) is lower**. By Henry's law, dissolved O₂ in blood drops → tissues are oxygen-starved → **anoxia** (weakness, confusion).
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