OXYGEN-TRANSPORT IN THE BLOOD OF ARCTIC MAMMALS - ADAPTATION TO LOCAL HETEROTHERMIA

被引:17
作者
BRIX, O
BARDGARD, A
MATHISEN, S
TYLER, N
NUUTINEN, M
CONDO, SG
GIARDINA, B
机构
[1] UNIV TROMSO,INST ARCTIC BIOL,N-9000 TROMSO,NORWAY
[2] UNIV ROME TOR VERGATA 2,DEPT EXPTL MED & BIOCHEM SCI,I-00173 ROME,ITALY
[3] UNIV OULU,DEPT PEDIAT,SF-90220 OULU 22,FINLAND
关键词
Arctic adaptation; Hemoglobin; Musk-ox; Oxygen-binding; Reindeer;
D O I
10.1007/BF00691710
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The oxygen binding of whole blood from humans and two arctic mammals, reindeer and muskox, has been studied as a function of carbon dioxide and temperature. All bloods display a marked Bohr effect with Bohr coefficients in the range -0.44--0.73. The Bohr effect is more pronounced at 20°C. The temperature sensitivity of reindeer and muskox blood expressed by the apparent heat of oxygenation, δH, is almost three times lower than that of human HbA under the same experimental conditions. This thermodynamic difference gives special benefits to arctic mammals with large heterothermy by safeguarding oxygen unloading at very low ambient temperatures. © 1990 Springer-Verlag.
引用
收藏
页码:655 / 660
页数:6
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