A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2012 · Q291 Mark
Why does the number of red blood cells in a human increase after several weeks at high altitude?
Ared blood cells are short-lived
Bthere is a high partial pressure of oxygen
Cto remove glucose from the tissues
Dto supply the tissues with enough oxygen
✓ Correct answer
D: to supply the tissues with enough oxygen
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