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
Define Advantages for underwater weighing method? This method is currently considered the "gold standard in percent body fat measurement (with the coming up of DEXA, the de

We now understand that mutations that cause the inhibition of apoptosis are found in tumours. Because proliferation itself is not induced by the inhibition of apoptosis, explain ho

State in detail about Dark Adaptation Dark adaptation is a phenomenon by which retina and pupil react to decreased illumination. Test is performed using Goldmann-Weeke's adapto

What happens to respiratory system in a man going up a hill?

Gill slits are the opening or the clefts between the gill arches in the fish. Water taken in by the mouth passes through the gill slits and bathes the gills. It also has rudimenta

Deinococcus radiodurans is a bacterium that was isolated from cooling ponds in and around nuclear power plants. It is highly resistant to ionizing radiation. Propose a hypothesis t

Question 1 Explain Sialography? How will you perform the same? Question 2 How will you set up your radiology department to take up the IVU studies? Question 3 D

Classification Scheme of Protozoa Phylum Myxozoa Parasites of lower vertebrates especially fish and invertebrates. Phylum Microspora Parasites of inv

Iron Iron is an essential component of the proteins involved in oxygen transport or utilization. These proteins, including hemoglobin, myoglobin and a number of cytochrome and

Define the Bioavailability of Vitamin K? Very little is known about the bioavailability of the K vitamins from different foods.  It has been estimated that the efficiency of ab