temperature regulation

• Endotherms – Organisms that can regulate their body temperature using metabolic processes
• Ectotherms – Organisms that cannot regulate their body temperature internally
• Ectotherms rely on behaviours to regulate their temperature 
• Endotherms can regulate their temperature by behaviours and physiologically
• Vasoconstriction – closing blood vessels to the skin keeping blood lower down
• Vasodilation – opening blood vessels to the skin so more heat is lost
• Pili relax to flatten hair and contract to make it stand on end trapping air
• Thermal receptors – in the skin and by blood flowing through temperature sensory in body

  Signal sent to – Thermal regulatory centre in hypothalamus