alleryStart learning →Why does urine output rise on arrival at high altitude?
AThe kidneys excrete excess bicarbonate ions
BLosing plasma concentrates the red cells left
CCold air reduces sweating and shifts fluid out
DLow pressure forces fluid out of the capillaries
Answer & Solution
Correct answer: B. Losing plasma concentrates the red cells left
1. The body increases micturition at high altitude to counteract the effects of lower oxygen levels.
2. Removing fluid drops blood plasma levels but not the total number of erythrocytes.
3. The overall concentration of erythrocytes in the blood therefore increases.
4. More red cells per unit volume helps tissues obtain the oxygen they need, which is why drinking more water at altitude matters.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.6 Modifications in Respiratory Functions_
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