[Dynamics of the reactions of small intestine vessels of animals at the high altitudes].

In acute experiments on cats carried out in Frunze (at an altitude of 760 m above the sea level, control group) and at the Touya-Ashu high-altitude base (3200 m above the sea level, Central Tien Shan), resistography and extracorporeal vein reservoir were used to study the reactions of resistance and capacitance blood vessels of the small intestine to intraarterial injection of adrenaline (0.5, 5 and 10 micrograms). The reactions were studied days 3, 15 and 30 after the animals stay in the mountains. It was found that during adaptation to extreme high-altitude conditions, the animals showed significant changes in the reactivity of alpha- and beta-receptors of smooth muslce cells, with these changes being inconsistent in the resistance and capacitance compartments of the small intestine.