Traduction et analyse des mots par intelligence artificielle
Sur cette page, vous pouvez obtenir une analyse détaillée d'un mot ou d'une phrase, réalisée à l'aide de la meilleure technologie d'intelligence artificielle à ce jour:
- comment le mot est utilisé
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Qu'est-ce (qui) est poikilotherm - définition
![The [[common frog]] is a poikilotherm and is able to function over a wide range of body core temperatures.](https://commons.wikimedia.org/wiki/Special:FilePath/Bgbo frosch ies.jpg?width=200 "The [[common frog]] is a poikilotherm and is able to function over a wide range of body core temperatures.")
![Sustained energy output of a poikilotherm (a [[lizard]]) and a [[homeotherm]] (a [[mouse]]) as a function of core body temperature. The homeotherm has a much higher output, but can only function over a very narrow range of body temperatures.](https://commons.wikimedia.org/wiki/Special:FilePath/Homeothermy-poikilothermy.png?width=200 "Sustained energy output of a poikilotherm (a [[lizard]]) and a [[homeotherm]] (a [[mouse]]) as a function of core body temperature. The homeotherm has a much higher output, but can only function over a very narrow range of body temperatures.")
Wikipédia
A poikilotherm () is an animal whose internal temperature varies considerably. Poikilotherms have to survive and adapt to environmental stress. One of the most important stressors is temperature change, which can lead to alterations in membrane lipid order and can cause protein unfolding and denaturation at elevated temperatures. It is the opposite of a homeotherm, an animal which maintains thermal homeostasis. While the term in principle can apply to all organisms, it is generally only applied to animals, and mostly to vertebrates. Usually the fluctuations are consequence of variation in the ambient environmental temperature. Many terrestrial ectotherms are poikilothermic. However some ectotherms remain in temperature-constant environments to the point that they are actually able to maintain a constant internal temperature and are considered homeothermic. It is this distinction that often makes the term "poikilotherm" more useful than the vernacular "cold-blooded", which is sometimes used to refer to ectotherms more generally.
Poikilothermic animals include types of vertebrate animals, specifically some fish, amphibians, and reptiles, as well as many invertebrate animals. The naked mole-rat and sloth are some of the rare mammals which are poikilothermic.
