Nervous system and the reflect arc

• What passes along nerve cells?

  Electrical impulses.
• What is the gap between two neurones called?

  Synapse.
• What is released across a synapse?

  Chemicals.
• CNS parts :

  Spinal cord

  Brain
• What is the role of a receptor?

  To detect a stimulus.
• What is the role of a sensory neurone?

  To transfer a signal from a receptor to the CNS.
• What is the role of a relay neurone?

  To transfer a signal from a sensory neurone to a motor neurone.
• What is the role of a motor neurone?

  To transfer a signal from the CNS to an effector.
• What is a reflex? 


  An automatic response to a stimulus.
• The pathway of a reflex arc?

  Stimulus -> receptor -> sensory neurone -> relay neurone -> motor neurone -> effector -> response
• 2 types of effectors?

  Glands

  Muscles
• Reflex examples :

  Sneezing

  Blinking when you get dust in your eye