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Definition of homeotherm in English: homeotherm(also homoiotherm) nounˈhɒmɪə(ʊ)ˌθəːmˈhōmēəˌTHərm Zoology An organism that maintains its body temperature at a constant level, usually above that of the environment, by its metabolic activity. Often contrasted with poikilotherm; compare with warm-blooded Example sentencesExamples - Terrestrial homeotherms have evolved five major solutions to deal with these threats and the stress axis plays a role in some of these.
- Indeed, humans are among the slowest-aging homeotherms.
- Also, there are large mammals which are endotherms, not inertial homeotherms.
- Man is a homeotherm, meaning that body temperature is kept within narrow limits by complex control mechanisms.
- As ground-nesting homeotherms, alpine and arctic birds must meet similar physiological requirements for breeding to other birds, but in more extreme conditions.
Derivatives adjectivehɒmɪə(ʊ)ˌˈθəːm(ə)l Zoology However, there is little evidence to show whether melanocytes in homeothermal vertebrates respond to visible light or not. Example sentencesExamples - The increase in the metabolic rate elicited in homoiothermal animals by exposure to cold is attributed by many investigators exclusively to striated muscle.
- When this happens, I'm told, the homeothermal regulatory mechanisms are so overwhelmed that they are no longer able to cope with the effects of the sun on our unpredictable sack of bones.
- Because of this function, it is considered to be an important factor that determines the efficiency of energy metabolism in homeothermal animals.
- Like all mammals, the cat is homeothermal, able to maintain its internal organs at a constant temperature (between 38 and 38.5°C).
adjectiveˌhɒmɪə(ʊ)ˈθəːmɪkˌhoʊmiəˈθərmɪk Zoology Homeothermic mammals regulate their body temperatures, and hence their energy expenditure, to a relatively constant and fairly high rate. Example sentencesExamples - The homeothermic capacity of chicks varied as a function of brood size, age, and air temperature.
- Reproductive effort may increase with high food abundance, especially for homeothermic endotherms, due to increased reproductive allocations and relatively stable metabolizable energy intake.
- General anesthesia inactivates the body's temperature-regulating mechanism and transforms the homeothermic body into a poikilothermic body - one that is altered by the temperature of the environment.
noun Zoology Endothermic homeothermy, or ‘warmbloodedness,’ is one of the major evolutionary developments of vertebrates, and among the most significant features that distinguish existing birds and mammals from reptiles, amphibians and fish. Example sentencesExamples - Similarly, because ambient temperatures decrease with altitude, the age at which homeothermy is attained might be expected to occur earlier in this species than in those of the same size in more favorable environments.
- In part because of their high metabolic rates (associated with homeothermy and endothermy), mammals often play an ecological role that seems disproportionately large compared to their numerical abundance.
- Most proponents of the insulation theory agree that the evolution of homoiothermy predated the evolution of avian flight and that the origin of avian flight was from an elevated site [i.e., tree-down] rather than from the ground-up.
- The advantages of endothermic homeothermy are seen in the wide range of habitats occupied by mammals, wider than for any other group of animals of similar diversity.
- Larger offspring might also maintain homeothermy better than smaller individuals because they possess better motor skills, a lower surface-area-to-volume ratio, and have greater tolerance for extreme low temperatures.
Origin Late 19th century: modern Latin, from Greek homoios 'like' + thermē 'heat'. Definition of homeotherm in US English: homeotherm(also homoiotherm) nounˈhōmēəˌTHərm Zoology An organism that maintains its body temperature at a constant level, usually above that of the environment, by its metabolic activity. Often contrasted with poikilotherm; compare with warm-blooded Example sentencesExamples - Terrestrial homeotherms have evolved five major solutions to deal with these threats and the stress axis plays a role in some of these.
- Man is a homeotherm, meaning that body temperature is kept within narrow limits by complex control mechanisms.
- Also, there are large mammals which are endotherms, not inertial homeotherms.
- As ground-nesting homeotherms, alpine and arctic birds must meet similar physiological requirements for breeding to other birds, but in more extreme conditions.
- Indeed, humans are among the slowest-aging homeotherms.
Origin Late 19th century: modern Latin, from Greek homoios ‘like’ + thermē ‘heat’. |