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Word Count: 426
Like some electrical appliances the body also has a thermostat to help keep the temperature constant This is known as the Hypothalamus This heat controlling centre is particularly sensitive to two types of stimuli These are changes of temperature of the blood and a series of impulses from the aprts of the skin that are exposed to the aterered temperature of the surroundings As soon as the temperature of the surrounds drop the body tends to lose heat more quickly then it can be produced This then sends a message to the hypothalamus Impulses are sent to the involuntary muscle layer in the small bloodvessels in the skin As a result the bloodvessels become narrower Les blood flows through the skin and consequently less heat is lost by conduction radiation etc The sweat glands produce less sweat consequently less sweat evaporates from the surface of the skin and less cooling occurs Should the temperature of the surroundings fall even further prevention of heat loss will not be sufficient to maintain a constant body temperature An increased rate of heat production will become necessary This is accomplished by an increase in muscle tone which requires mroe energy consequently more oxidation occurs in the muscle cells Should more heat be necessary more impulses are sent and thus the person will start to shiver The skin muscles will also contract erecting root hairs Air will then be trapped between the hairs and air is a poor conductor of heat When surrounding temperatures rise above normal the warmed blood or surrounding temperature stimulates relevent corupuscles in the skin More blood flows near the surface of the body therefore more heat loss is possibl More blood is supplied to the sweat glands so they secrete more sweat and evaporation occurs more rapidly Should this not be sufficient the production of heat is limited by loweing of muslce tone and thus the individual becomes less
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