What is thermoregulation in cold, Biology

Assignment Help:

What is Thermoregulation in Cold?

Heat production parallels the increase in O2 uptake, the magnitude of which depends on the muscle mass .engaged in slivering or work and the duration of activity.  Shivering alone can produce only a four-fold increase above basal rates of heat production. The increase in O2 uptake during shivering thermo genesis is also accompanied by an increase in cardiac output. This increase is due to increase in stroke volume, which is associated with cold-induced peripheral vasoconstriction. The effect of the mechanisms used to protect against heat loss depends on the body surface area in comparison with body mass. The problems may arise in malnourished subjects who have lost both fat mass, as well as, lean body mass. Cold acclimatization can occur in human subjects but it is minimal. An important modifying factor on the thermoregulatory response to cold is the individual's provision of subcutaneous fat, since fat reduces thermal conductance from the core to the body surfaces. Physical fitness has mixed effects; the fittest individuals show more heat production but at the same time, being lean in structure, they lose heat more quickly. Severe losses of body weight in a cold environment complicate the normal physiological responses to cold.  Thus, maintaining an adequate intake in cold environment especially under physically active conditions is important. There is a common belief that cold climatic conditions lead to an increased appetite. The evidence for this conclusion is derived from

Changes in body weight; self reported intakes in cold environment at sea level (SL).  However, the reported increase in appetite is also associated with changes in other aspects of subject's environment such as increased activity levels, energy expenditure due to thermo genesis, social isolation and modification in the diet. In animals, increased energy expenditure caused by increased thermo genesis due to cold environment is compensated by increased intakes,

In human subjects, increased energy intake requirements do not always trigger an increase intake and appetite immediately. Humans can adapt over a period of time to a high fat diet to make the food energy dense. Now that we are aware of the concept of thennoregulation, let us look at the dietary patterns and the factors affecting food intake of the people residing in cold conditions.


Related Discussions:- What is thermoregulation in cold

Chemical substances that compose the plasma membrane, What are the chemical...

What are the chemical substances that compose the plasma membrane? Ans) The major constituents of the plasma membrane are phospholipids, proteins and carbohydrates. The phosphol

Define class – arachnida, Define Class – Arachnida? The class Arachnida (...

Define Class – Arachnida? The class Arachnida (Arachnida = spider) has terrestrial and few aquatic animals. It includes spider, scorpions and mites. 1. Prosoma bears. six pair

Describe genetic equilibrium is maintained in population, a) How does the H...

a) How does the Hardy- Weinberg's expression (p²+2pq+q² =1) Describe that genetic equilibrium is maintained in a population? (b)  List any two factors that can disturb the ge

What do you understand by melanocytes, Q. What are melanocytes? Melanoc...

Q. What are melanocytes? Melanocytes are epithelial cells of the skin specialized in secretion of melanin and Melanin is a pigment that besides coloring the iris of the eye and

Syringe, Can you use a regular syringe instead of a gas syringe in a lab

Can you use a regular syringe instead of a gas syringe in a lab

Explain differential staining technique, Explain Differential Staining Tech...

Explain Differential Staining Technique? It divides bacteria into separate groups based on staining properties, like Gram's stain, Acid-fast stain etc. Here 2 or more contrasti

How to calculate the value of threshol, Consider a properly functioning pos...

Consider a properly functioning positive feedback system whose output variable is not equal to plateau at 1:00 AM.  At 1:00 AM, A. when the value of threshold is greater than t

Zoo flagellates, #question names of 10 zoo flagellates

#question names of 10 zoo flagellates

Poultry and duck diseases-marek''s disease, Marek's disease Marek's dis...

Marek's disease Marek's disease is a lymphoproliferative disease of chicken, quails, bantams and other free-flying birds. It is caused by the Gallid Herpesvirus 2 of subfamily

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd