Thermoregulation

• Regulation of heat to appropriate condition in body when temperature varies(too cold or too hot)
• This is regulated by skin and its blood supply.

Maintenance of body temperature against heat:

• When environment is too heat, it is sensed. Now, arterioles begin to dilate, called vasodilatation. So more blood flow to skin, more easy to evaporate heat.

   Heat can dissipate and leave through convection, radiation, etc.

• Sweating through skin play important role in thermoregulation. Sweatsevaporate and make the skin surface cool.
• Arrectorpilli muscle help in heat loss by keeping hairs of skin flat so heat can leave through flow of air.

Maintenance of body temperature against cold:

• When we felt too cold, blood vessels in skin get contracted. i.e. vasoconstriction

So, less blood flow as a result heat gets protected in core. So, less heat gets evaporated.

• Process of sweating will be less
• Arrector pilli muscle, make hair erect so that it can trap heat and it cannot flow through skin. As a result, we feel warm.