Controlling body temperature

• What does the thermoregulatory centre do?

  Receives information from receptors that trigger the effectors
• What happens when the body is too hot?

  Sweat is secreted and evaporated, which takes heat away from the body too
• What happens to the blood vessels when the body is too hot?

  They dilate, so more blood flows to the surface of the skin. This is called vasodilation
• What happens when the body is too cold?

  The hairs stand up to trap an insulating layer of air, muscles contract as the body shivers
• What happens to the blood vessels when the body is too cold?

  Blood vessels close off the skin's blood supply. This is called vasoconstriction