The Nervous System, Synapses & Reflexes

• What passes along nerve cells?

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

  Synapse
• What is released across a synapse?

  Chemicals 
• what is part of the central nervous system (CNS)?

  Brain and spinal cord.
• 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 motor neurone?

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

  To transfer a signal from a sensory neurone to a motor neurone
• 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
• What are the two main types of effectors? 

  Glands

  Muscles
• Reflexes are:

  Fast

  Automatic
• examples of reflexes?

  Blinking when you get dust in your eye

  Sneezing 
• Why are reflexes important? 

  They protect us from harm
• receptor

  
• effector