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Definition
| The maintenance of internal body temperature within a tolerable range. |
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| Referring to organisms with bodies that are warmed by heat generated by metabolism. This heat is usually used to maintain a relatively stable body temperature higher than that of the external environment. |
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| Referring to organisms for which external sources provide most of the heat for temperature regulation. |
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| An animal whose body temperature varies with its environment. |
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| An animal who has a relatively constant body temperature. |
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| The emission of electromagnetic waves by all objects warmer than absolute zero. |
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| The process by which a liquid changes to a gas. |
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| The direct transfer of thermal motion (heat) between molecules of objects in direct contact with each other. |
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| The mass movement of warmed air or liquid to or from the surface of a body or object. |
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| The outer covering of a mammal's body, including skin, hair, and nails. |
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| An increase in the diameter of superficial blood vessels, increasing blood flow in the skin. |
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Definition
| A decrease in the diameter of superficial blood vessels, reducing blood flow and heat transfer. |
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| The exchange of a substance or heat between two fluids flowing in opposite directions. For example, blood in a fish gill flows in the opposite direction of water passing over a gill, maximizing diffusion of oxygen into and carbon dioxide out of the blood. |
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| countercurrent heat exchanger |
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Definition
| An antiparallel arrangement of blood vessels. |
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Definition
| Heat production, increased by such muscle activity as moving or shivering. |
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| nonshivering thermogenesis |
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Definition
| When certain hormones cause mitochondria to increase their metabolic activity and produce heat instead of ATP. |
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Definition
| A tissue that some mammals have in the neck and between the shoulders that is specialized for rapid heat production. |
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Definition
| The ventral part of the vertebrate forebrain; functions in maintaining homeostasis, especially in coordinating the endocrine and nervous systems; secretes hormones of the posterior pituitary and releasing factors that regulate the anterior pituitary. |
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