Abstract

SummaryEvidence is presented to show that the weight increase of the adrenals of rats exposed to a pressure of 225 mm Hg for 7 hr is due to hyperemia, indicating hyperactivity of the gland in response to the stress af anoxia. At this reduced pressure, the gland is unable to respond to the body's requirements and undergoes exhaustion atrophy as evidenced by histological examination and wet and dry weight determinations at the end of 24 hr decompression.

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