Sympathetic Neurones

Sympathetic Neurones

1. Sweating

   • A rise in temp. causes nervous system to send signals to sweat glands
   • The glands produce sweat which evaporates - cooling the body
     • Bonds are broken & the energy is removed from the body
   • Once body temp. decreases sweat stops being produced

2. Vasodilation

   • If the temp. rises the blood vessels dilate
   • This means that more heat is lost from the skins surface
   • The shunt contracts pushing more blood through the blood vessel

3. Vasoconstriction

   • If the temperature falls the blood vessel constricts
   • This takes the blood away from the surface of the skin
   • This means that less heat is lost from the skins surface

4. Shivering

   • This is the muscles contracting
   • ATP is broken down to ADP
   • This gives out heat energy to warm the blood temperature back up

5. General

   • They are motor neurones
   • They are the body's response to a temperature change

6. Pilo - Erection

   • Body Temp. falls causing muscles to contract
   • This causes hair to stand up
   • This causes a trapping of air which acts as insulation