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DISTRIBUTION OF BLOOD IN THE AROUSING HIBERNATOR
ARCTIC AEROMEDICAL LAB FORT WAINWRIGHT ALASKA
The distribution of circulating blood has been studied in the arousing hibernator following the method of fractional distribution of radioactive indicators Sapirstein, 1958. The results indicate a conspicuous differential vasoconstriction of the posterior part of the animal during the most active phase of arousal. The blood flow to skeletal muscle in the front part of the arousing animals is more than 16 times greater than in the awake non-hibernating animals. The perfusion rate to the myocardium is twice as large in the arousing animal. Likewise the lungs, diaphragm, and brown fat show a substantial increase in blood flow. Blood flow to gastrointestinal tissues is greatly reduced in the arousing animals, whereas flow to the skin, liver, and thyroid shows insignificant differences. Author