Reflexes

• What are the reflexes?


  Rapid, automatic responses to cerain stimuli that don`t involve the conscious part of the brain - they can reduce the chances of being injured
• Where do neurons in reflex arc go through?


  The spinal cord or through an unconscious part of the brain
• What happens when a stimulus is detected?


  It is detected by receptors and impulses are sent along a sensory neurone to CNS
• Where do impulses travel after?


  Reach a synapse between the sensory neurone and relay neurone, they triger chemicals to be released. These chemicals cause impulses to be sent along the relay neurone
• What happens when the impulses reach a synapse between the relay neurone and motor?


  The same thing happens, chemicals are released and cause impulses to be sent along the motor neurone
• What do impulses do then?

  Travel along the motor neurone to the effector (muscle/gland)
• What does effector do?


  Contacts
• Because you don`t have to think abou the response it`s quicker than normal ones