the body temperature of a mammal is kept constant
to maintain this temperature the mammal must be able to balance its heat loss against the heat gain
body temperature is controlled by the hypothalamus, a specialized part of the brain
changes in the temperature within the body and the surrounding are detected by the hypothalamus it transmits impulses to the skin and the blood stream in response to temperature changes hypothalamus acts as a thermostat for the body
a mammal loses heat by breathing out, urine, feaces, skin by radiation and by evaporation of sweat.
A mammal generates heat by the activity of its muscles, by general metabolism in respiration, or chemical activities
In hot conditions the hypothalamus stimulates responses that increase heat loss from the body hence lowering the body temperature
Such responses include sweating, vasodilation, keeping its hair ?at on the surface of skin and reduction of metabolic rate
In cold conditions the hypothalamus stimulates responses that generate heat gain in the body and reduce heat loss to the environment
Such responses include shivering, vasoconstriction, raising its hair to trap a layer of air around the skin because still air is a good insulator of heat and by generation of heat by increasing metabolic rate.
Mohaissack answered the question on October 5, 2017 at 14:27
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