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- W1994238497 abstract "We measured circulating levels of catecholamines in painted turtles subjected to anoxia with different degrees of concomitant acidosis at 20 degrees C and in turtles subjected to long-term submergence at 3 and 10 degrees C. Blood levels of both epinephrine (E) and norepinephrine (NE) increased during N2-breathing, N2/CO2 breathing and submergence, with NE generally being present in higher concentrations than E. During submergence at 20 degrees C, anoxic turtles experienced an extreme acidosis and NE levels exceeded 18,000 pg/ml. The greater the degree of acidosis in anoxic turtles the higher were the levels of plasma NE (log [NE; pg/ml] = 1.640 x pHa + 15.776, r = -0.826). Elevation of plasma E under anoxic conditions was more modest and the correlation between plasma E and pHa was less pronounced (log [E; pg/ml] = -0.329 x pHa + 6.069, r = -0.285). Submergence at lower temperatures also resulted in increases in plasma levels of NE, but while plasma E generally increased during anoxia, this elevation was less dramatic than that observed for NE. Exposure of turtles to either mild (6.5% CO2) or severe (14.5% CO2) normoxic hypercapnia resulted in no increase in E and only modest increases in NE. Upon resumption of air-breathing in all of the 20 degrees C protocols, turtles rapidly restored E and NE to control levels. The function of elevated plasma catecholamines during anoxia and acidemia in turtles is unknown but may be important in stimulating respiratory and cardiovascular recovery once air-breathing is resumed. Catecholamines may also play a role in mediating the rise in blood glucose we observed in this study, which may be an important factor in maintaining tissue viability during anoxic stress." @default.
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- W1994238497 date "1991-06-01" @default.
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- W1994238497 title "Effects of anoxia and graded acidosis on the levels of circulating catecholamines in turtles" @default.
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- W1994238497 doi "https://doi.org/10.1016/0034-5687(91)90130-b" @default.
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