Data/hora: 09/06/2024 03:35:54

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 05/11/1996
Data da última atualização: | 03/04/2017
Autoria: | HICKS, J. W.; WOOD, S. C.
Título: | Temperature regulation in lizards: effects of hypoxia.
Ano de publicação: | 1985
Fonte/Imprenta: | American Journal of Physiology, v.248-B, p.R595-R600, 1985.
Idioma: | Inglês
Conteúdo: | Temperature regulation during external (lowered lung PO2) and internal hypoxia (anemia) was examined in four species of lizards. Exposure to a hypoxic gas mixture in a thermogradient resulted in the animal lowering their selected (preferred) body temperature. A 50% reduction in the O2 carrying capacity of the blood also reduced the selected body temperature. Lizards "shuttle" when forced to select a temperature either above or below their normal selected temperature. Exposure to hypoxia decreases the upper and lower exit temperatures during shuttling. Furthermore, a decrease in the inspired O2 cauises the rate of heating to no longer exceeed the rate of cooling as in normal. The behavioral reduction of body temperature and the altered neural and physiological aspects of temperature regulation appear to be generalized responses to impaired O2 transport and not PO2 per se. The reduced body temperature, by lowering metabolic demand, provides an effective, even life-saving, adaptation to hypoxia.
Palavras-Chave: | Lizard; Reptile.
Thesagro: | Anemia; Lagarto; Réptil; Temperatura do Corpo.
Thesaurus Nal: | body temperature.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (33215-1) - ADD - SP - PP - SP15061 -  - 15061 - DIS