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Ectotherm: A coldblooded animal, one having a body temperature determined primarily by the temperature of its surrounding environment. Terrestrial reptiles are ectotherms.
More Biology Terms ...

Ectothermy - This refers to creatures that control body temperature through external means (Greek: "ectos"εκ"ος = "outside," "thermos" θερμος = "warm"), such as the sun, or flowing air/water. For more on this, see below.

ectotherms Animals with a variable body temperature that is determined by the environment. Examples: fish, frogs, and reptiles.

[Gk. ecto, outside + therme, heat]
An animal such as a reptile, fish, or amphibian, that must use environmental energy and behavioral adaptations to regulate its body temperature.
effector cell ...

Main article: Ectotherm
Even though fishes are ectotherms some have developed the ability to remain functional even when the water temperature is below freezing and some even use natural antifreeze to resist ice crystal formation in their tissues; ...

An animal, such as a reptile, fish, or amphibian, that must use environmental energy and behavioral adaptations to regulate its body temperature.
Covered in BIOL1020 Lab 4 Cellular Energetics I ...

~s and endotherms manage their heat budgets very differently.
One way to classify the thermal characteristics of animals is to emphasize the role of metabolic heat in determining body temperature.
~s gain most of their heat from the environment.

~ An organism whose internal temperature varies with that of the environment. Compare endotherm.
~ic Having a variable body temperature derived from heat acquired from the environment; contrasts with endothermic.
ectotympanic ecto = outer; tympani = a drum.

~ an animal that uses the enviroment to regulate its body temperature
Effector a cell or organ that responds to a stimulus
Electrocardiogram (ECG) a graph showing the electrical activity in the heart during the cardiac cycle ...

Exothermic ~ic term used to describe an animal which controls its body temperature externally (by basking in the sun to warm up or moving to a shady place to cool off)
(exo ecto = out outer; thermo = heat) ...

~s, animals — the other vertebrates and the invertebrates — that secure their heat from their surroundings (e.g., by basking in the sun). ~s are "cold-blooded" or poikilothermic.
The major source of heat for endotherms is the metabolism of their internal organs.

They are characterized as non-amniote ~ic (or cold-blooded) tetrapods. Most Amphibians undergo metamorphosis from a juvenile water-breathing form to an adult air-breathing form, but some are paedomorphs that retain the juvenile water-breathing form throughout life.

Arthropods, reptiles, and amphibians are ~s who receive their body heat from external sources. In order to keep at a suitable internal body temperature, they rely on their environment heavily for gaining or shedding body heat.

Taxonomy: analogous, binomial nomenclature, biodiversity, ~ic, taxonomy, exoskeleton, hydrostatic skeleton, invertebrate, vertebrate, analogous structures, class, family, genus, Linnean taxonomy, order, phylum, species, subspecies ...

Atkinson D: Temperature and organism size - a biological law for ~s?
Adv Ecol Res 1994, 25:1-58.
Davidowitz G, D'Amico LJ, Nijhout HF: Critical weight in the development of insect body size. ...

Like fishes and amphibians, beings of the class Reptilia are heterothermic animals (also known as poikilothermic, or ~ic), i.e., they are not able to control by themselves their body temperature and thus they depend on external warm sources (mainly the sun).

Temperature: The major effect of temperature is on the enzymes controlling metabolic reactions. As a rule plants will develop more rapidly in warmer temperatures, as will ~ic animals. It is partly due to temperature that migrations occur.

See also: See also: What is the meaning of Animal, Environment, Animals, Organ, Blood?

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