Nervous System

Nervous System

1. Why do you need a nervous system?

   • What is a receptor?

2. What is the job of the nervous system?

   • Body is sensitive to changes
     • Takes information from sorrounding and helps you react in the correct way
       • Avoid danger, find food and a mate

3. How?

   • Sends electrical signals (impulses)
     • travel very fast (1-120m/s)

4. What are the stages?

   • Stimuli
     • detects changes in the world around you
     • change is picked up by
     • Receptor
       • Cells
         • Where are you going to find them?
           • Name the 5 sense?
       • Neurons
         • Special cells (animal cells)
           • Found in bundles of 100s and 1000s
             • send impulses from the _____ to the ____
         • Co-ordinator (CNS)
           • Made up of the brain and spinal cord
             • Huge amount of info received and brain co-ordinates it
           • Motor neurone
             • sends info to make the right bits of body move
             • Effector organ
               • Name them?

5. What are receptor cells?

   • pick up changes in the stimuli
     • Where will you find them?

6. What are neurons?

   • Cells that send impulses from the receptor to the CNS

7. Name the co-ordinator here?

   • CNS
     • Which is made up of the brain and spinal cord