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!
Tolerance to Cold and Freezing Temperatures
In the earlier section you have been studying about tolerance of animals to high temperature. Now in this subsection we will study about tolerance to cold and freezing temperatures. The effects of low temperature are equally perplexing as those of high temperature. Some organisms can tolerate extensive freezing but most animals cannot. Animals that live in '4 temperature and cold regions are often exposed to long periods of winter temperatures that are far below the freezing point of water. Survival of ectothermic animals at such subzero temperature depends upon the physiological and biochemical characteristics that can be described as cold hardiness. An animal can develop cold hardiness either by developing capacity for freeze tolerance or by avoiding ice formation even if exposed to temperatures as low as -40°C to -50°C. The latter are regarded as freeze intolerant.
The intertidal marine invertebrates of colder zones are freeze tolerant in the sense that they survive extensive ice formation within their bodies. Many other animals also survive in spite of extensive ice formation. For example, midge Chironomous larva from Alaska can be frozen and thawed repeatedly without injury. Several species of insects are known to contain high concentration of glycerol in their body fluids. It is well-known that glycerol protects red blood cells and mammalian spermatozoa from injury caused by freezing. Therefore, glycerol is widely used for this purpose and samples of human or bull sperm can be kept frozen and viable for several years using glycerol. Without such treatment, freezing is Iethal, to sperms. Only a few vertebrates tolerate extensive ice formation. Birds and mammals however, are not known to tolerate freezing.
What is a community? What is the difference between the concepts of community and population? A community is a set of the populations of living beings that live in the same reg
What are the dietitians services Dietitians are engaged in a variety of positions and in a number of work settings. Of course the largest proportion is involved engaged in
Explain the Completed Test - Most Probable Number Test? Coliform colonies on EMB or Endo agar are further examined by completed test by inoculating lactose broth and nutrient a
Q. Which are the organs of the excretory system? The excretory system is formed of ureters (two), kidneys (two), bladder and urethra.
What is a terrestrial organism? 'Terra' is the Latin word for earth. Thus, an animal that lives on the surface of the earth is known as terrestrial. This is the similar root wo
#qprokroyotic flagella structure and protocoluestion..
Describe the factors that affect cardiac output in a female athlete who is speed skating toward the finish line in an Olympic race
Explain Strengthening the public health measures? Parasitic infestations and protozoal infections cause iron deficiency through loss of blood or destruction of red blood cells.
What is aves?
Q. What are the Valvular heart diseases? Valvular heart disease is a common clinical problem. While rheumatic mitral valve disease seen more often in the underprivileged segmen
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