Rats were exposed to a single (30 min) or repeated (30 min x 10, daily) normobaric hypoxia by a gas mixture with 10% of O2. In both cases urgent adaptive reactions develop in the lungs in the form of epithelium desquamation, increasing migration of neutrophils into the lung tissue, enhancement of labrocyte degranulation. Long-term adaptive reactions develop after the repeated exposures: proliferation of connective tissue labrocytes, hyperplasia of the lymphoid tissue associated with bronchi.
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