Topic 5- The Nervous System

Topic 5- The Nervous System

1. What is The Nervous System?

   • it is a network of nerve cells that allows humans to react to their surroundings and coordinate their behaviour
   • It carries very fast electrical impulses so you can react quickly to your environment

2. Parts of The Nervous System

   • Central Nervous System (CNS)
     • consists of the brain and spine
   • Motor Neurones
     • The long axon to carry nerve impulses from one part of the body to another
     • neurones that carry electrical impulses from the CNS to the effectors
   • Sensory Neurones
     • lots of dendrites to make more connections
     • neurones that carry information as electrical impulses from the receptors to the CNS

3. Synapses

   • the connection between to neurones is called a synapse
   • the nerve signal is transferred by chemicals which diffuse across the gap
   • these chemicals send off a new electrical signal in the next neurone

4. Pathways of the Nervous system

   • voluntary/concious action
     • brain can control
   • reflex action/unconcious action
     • brain cannot control

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