nonshivering thermogenesis


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nonshivering thermogenesis

thermogenesis resulting from the effects of the sympathetic nervous system neurotransmitters, epinephrine, and norepinephrine, acting to increase the cellular metabolic rate in skeletal muscle and other tissues, thereby increasing heat production. In a specialized form of adipose tissue, brown fat, the effect of the sympathetic neurotransmitters is to increase the rate of uncoupled oxidative phosphorylation by the mitochondria, which results in heat production without formation of adenosine 5'-triphosphate.

nonshivering thermogenesis

[-shiv′əring]
a natural method by which newborns can produce body heat by increasing their metabolic rate.

non·shiv·er·ing ther·mo·gen·e·sis

(non-shiv'ĕr-ing thěr'mō-jen'ĕ-sis)
Thermogenesis resulting from the effects of the sympathetic nervous system neurotransmitters, epinephrine and norepinephrine, acting to increase the cellular metabolic rate in skeletal muscle and other tissues, thereby increasing heat production. In a specialized form of adipose tissue, brown fat, the effect of the sympathetic neurotransmitters is to increase the rate of uncoupled oxidative phosphorylation by the mitochondria, which results in heat production without formation of adenosine triphosphate.

thermogenesis

the production of heat, especially within the animal body.

diet-induced thermogenesis
a portion of dietary calories in excess of those required for immediate energy requirements are converted to heat rather than stored as fat. Some types of obesity may be related to a defect in this mechanism.
neonatal thermogenesis
thermogenesis is relatively inefficient in neonates, especially piglets, so that it becomes very important to protect them from cold stress. Most of their heat gain comes from the metabolism of their stores of brown fat.
nonshivering thermogenesis
increased heat production due to enhancement of normal calorigenic metabolic processes.
shivering thermogenesis
much the fastest thermogenic process which the static body can use. Shivering is an involuntary function with a tremor rate of about 10 per second.