Athletes often move from low altitude to high altitude to train for a race.
Which statements about the effect of training at high altitude are correct?
1 Higher concentrations of carbon dioxide stimulate greater oxygen dissociation.
2 Lower concentrations of oxygen stimulate the uptake of more oxygen by red blood cells.
3 Lower partial pressures of oxygen stimulate higher production of red blood cells.
1 )
1 and 2 only
2 )
2 and 3 only
3 )
1 only
3 only
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