[Adaptive changes in the blood during hypoxia of varying duration].

A relationship has been established between erythropoiesis specificity and oxygen binding properties of the blood and hypoxic exposure. Relatively short-term adaptation to hypoxia produces phenotypic and quantitative rearrangements. Erythropoiesis of high tension gives rise to a great number of young short-lived red cells. Prolonged hypoxia induces qualitative genetically fixed changes.