Nonshivering thermogenesis, Biology

Nonshivering Thermogenesis

The nonshivering thermogenesis is a widespread phenomenon in mammals. It refers to the processes that produce heat by means other than shivering. It is not certain whether birds produce heat by nonshivering. One of the well-known sites of nonshivering thermogenesis in mammals is the brown adipose tissue, also called brown fat.

1592_Nonshivering Thermogenesis.png

Figure: Brown fat deposition in the bat

The brown adipose tissue contains great numbers of mitochondria and is richly vascularised. Release of norepinephrine into the tissue by the sympathetic nervous system results in a great increase in oxidation of lipid and release of heat. Brown fat, like nonshivering thermogenesis is specially prominent in new born individuals, hibernators and cold acclimated adult mammals. The brown fat tends to occur in discrete masses, located in the neck, interscapular region, axillae and abdomen. Among hibernators brown fat is believed to help in rewarming the body during emergence from hibernation. New born mammals use brown fat in routine thermogenesis. The principal mechanism of heat production by brown fat is by uncoupling the oxidative phosphorylation that occurs in the mitochondria. Thus, oxidation of food-stuffs results in the production of heat.

Posted Date: 1/16/2013 5:45:02 AM | Location : United States







Related Discussions:- Nonshivering thermogenesis, Assignment Help, Ask Question on Nonshivering thermogenesis, Get Answer, Expert's Help, Nonshivering thermogenesis Discussions

Write discussion on Nonshivering thermogenesis
Your posts are moderated
Related Questions
Q. What is represented by the cellular secretion? Cell secretion is the removal to the exterior of substances produced by the cell for instance, hormones, mucus, and sweat, so

Changes in the Ions The concentration of potassium, phosphate and nitrate declined significantly in the bathing medium within four days. The concentration of so

Describe the Stages of Atherosclerosis ? The process of atherosclerosis which gives rise to CAD marches in stages. The earliest recognizable pathologic lesions are the fatty st

Which type Ribosome occurs exclusivley in Mitocondria?

Define the Over nutrition obesity of Infant? An infant is never put on a reducing diet. The chances of obesity are least if an infant is exclusively breast-fed till 6 months. I

TYPES OF BLASTULA - Blastulas are of following type -                    1 .       STEREOBLASTULA - The blastocoel is very small. It's blastomere are less in num

Explain the Precautions for Detection of Number of Bacteria in Milk? 1. Make a thin film of milk on the slide. 2. Do not over stain with methylene blue.  If over staining ha

Q. Waste produced during surgical process? Regular garbage: Regular garbage generated from clerical office procedures or kitchen waste should be disposed of within the usu

Define the Meaning of Goitrogens? Goitrogens are substances that interfere with iodide metabolism in any way that inhibits thyroid hormone synthesis. As a result, there is augm

Q. Prevention and Control of Staphylococcal food poisoning? Staphylococcal food poisoning can be prevented by: 1. Avoiding contamination of food with S. aureus. 2. Prev