Define nutritional requirement in cold and polar environment, Biology

Assignment Help:

Define Nutritional Requirements in Cold and Polar Environment?

Energy requirements are the major consideration for providing nutritional support in a cold environment. Energy expenditure is usually limited by the rate of heat build up and hypoxia, respectively in hot and altitude environments whereas in cold, no such type of restriction exists. Energy requirements in cold environment are influenced by the intensity of the cold, wind speed, physical factors (like melting snow, locomotion on icy or snow covered surfaces etc.) and altered solar periodicity in Arctic and Antarctic areas.

Cold exposure increases energy requirements. It is reported that people in cold climate normally eat more than those in warm climate. The increased energy requirements are due to the 'hobbling' effect of the clothing weight (7-10 kg) and are associated with the efforts of locomotion. The weight of cold weather clothing has decreased as technology has improved; however, clothing is still a considerable burden. It appears that the heat loss in a cold environment is considerably reduced through thermoregulation, clothing and behaviour i.e. seeking shelter whenever possible, creating or moving to warmer environments. Moreover, skeletal muscle contractions, either during voluntary exercise or involuntary shivering are the major source of metabolic heat produced to protect against cold stress. These are a few mechanism adapted by our body to regulate, the body temperature in conditions of cold. Let us next get to know about the concept of thermoregulation.


Related Discussions:- Define nutritional requirement in cold and polar environment

Explain characteristics that make breastfeeding beneficial, Explain charact...

Explain characteristics that make breastfeeding beneficial to the infant? We have listed some characteristics that make breastfeeding beneficial to the infant: • Mature milk

Show the anatomical evidence, Q. Show the Anatomical Evidence? Anatomy ...

Q. Show the Anatomical Evidence? Anatomy is the study of the structure, organisation and development of cells and tissues of plants and animals. For over a century taxonomists

Explain about the dysphagia, Explain about the Dysphagia? Dysphagia is ...

Explain about the Dysphagia? Dysphagia is the inability to swallow or difficulty in swallowing. It is a common problem in those with neurological disorders and can occur in any

Causes of cancer, Causes of Cancer Scientists have identified the cellu...

Causes of Cancer Scientists have identified the cellular genes that code for those proteins which jointly control and regulate cell growth and division. These  genes are of two

Genotype for each individual, The allele that causes albinism (p) is recess...

The allele that causes albinism (p) is recessive to the allele for normal pigmentation (P). A normal woman whose father is an albino marries an albino man whose parents are both no

Characteristics of female''s skeleton, CHARACTERISTICS OF FEMALE'S SKELETON...

CHARACTERISTICS OF FEMALE'S SKELETON - 1.      Skull is lighter. 2.      Shoulders are nanow. 3.      Sacrum is shorter but wider. 4.      Pelvis is wider. 5.

Why dietary obtainment of iodine important for thyroid, Q. Why is the dieta...

Q. Why is the dietary obtainment of iodine so important for thyroid functioning? The obtainment of iodine from the diet is vital for the thyroid because this chemical element i

Determine lamellar compaction and remodeling, Lamellar compaction and remod...

Lamellar compaction and remodeling (6 to 18 weeks) A remodeling phase is initiated in which hematopoietic-derived osteoclastic cells form cutting cones will remove the establis

What is bioremediation, Q. What is bioremediation? The Bioremediation i...

Q. What is bioremediation? The Bioremediation is the use of microorganisms, like protists, bacteria and fungi to degrade noxious substances turning them into non toxic or less

Amphibia, an assignment of amphibians

an assignment of amphibians

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