Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Explain the Sampling and Analysis of Microbial Load? A food or equipment can be free of visible dirt and still be carrying microorganisms or chemicals that can cause food borne
Long-term responses - Behaviour of Plants Plants alter their course of development to suit the prevailing environmental conditions. For example, leaf maturation and fall, onse
Explain about enzymes All enzymes are proteins. Many enzyme proteins lack catalytic activity in the absence of a non-protein component, called a 'co-factor'. In this case, the
Pollen Tube Growth There are significant differences in the fine structure of the tips of pollen tubes in compatible and incompatible pistils such as Lilium. Tubes growing in
What are plant organs responsible for the perception of light variation? And what is the pigment responsible for this perception? The Leaves are mostly responsible for percepti
Define Gas liquid chromatography? This is used for separating and identifying volatile compounds of fatty acids, hydrocarbons, sterols, amino acids and lipids, even from nanogr
How does the heart impel the blood? The heart is a muscular organ that having chambers (right atrium and right ventricle and left atrium and right ventricle) by which blood pas
(a) What are the immediate effects of exercise on the functions of (i) the heart, (ii) the lungs, (iii) the liver? (b) How do these changes help to meet the needs of exercise
Define Energy requirements of infants? Energy: Energy requirements of infants are based on the energy intake through breast milk by infants of well-nourished mothers. Based on
Q. What is the essential morphology of a protozoan cell? Protozoans are eukaryotic cells so they have structures and organelles common to this kind of cell endoplasmic reticula
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd