reflexes

• what are reflexes?


  reflexes are rapid, automatic responses to certain stimuli that don't involve the conscious part of the brain
• what is a reflex arc?

  the passage of information in a reflex ( receptor to effector )
• true or false. reaction time is the time it takes to detect a stimulus


  false. reaction time is the time it takes to respond to a stimulus
• reflexes do not involve conscious parts of the brain. why is this advantageous?


  it reduces the chance of an injury , as it means that reflexes can be rapid and automatic
• alcohol is a depressant which recurs the effectiveness of neurone signalling. suggest what effect this would have on a persons reaction time.

  reaction time will be slower because the nerve signals take longer to transmit around the body, so the response takes longer
• name three types of neurone in a reflex arc.

  • relay neurone
  • sensory neurone
  • motor neurone