ANSC 3080 Lecture Notes - Lecture 30: Catecholamine, Subcutaneous Tissue, Wind Chill
27 Mar 2018
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Document Summary
Automatic coordinated response involving multiple organ systems to maintain a constant and normal internal environment. Lactating cows have a higher temp because of an increase in metabolism. Doesn"t change but is influenced by environment, exercise, metabolism. Change in temp of the shell would not lead to death (frostbites), but change in. Shell body temp temp of the core will. No adjustment of heat production or loss within this range of temp. Generally poor tolerance to heat than to cold. Animals are easier to generate more heat than dissipate heat. Cold stress increases metabolism to generate heat. Generally fatal because enzymes denature, cells die. Heat comes from metabolism (heart, liver, kidney, brain) The best way to quickly generate heat. Shivering is a rhythmic involuntary muscle contraction when exposed to cold. Dedicated only to heat production not movement. Sympathetic ns catecholamines (epi/norepi) increase metabolism (calorigenic) Long term exposure to cold, when shivering cannot work anymore.
