Nervous system

• What type of nerve cell sends information to effectors?

  Motor neurones
• What are effectors in the nervous system?

  Muscles or glands that respond to signals
• What is the role of the nervous system?

  Directs changes and responds to stimuli
• What is the pathway of a stimulus in the nervous system?

  • Stimulus
  • Receptor
  • Sensory neurone
  • CNS
  • Motor neurone
  • Effector
  • Response
• What are reflexes?

  Autonomic, rapid responses to stimuli
• Why do reflexes avoid injury?

  They do not involve the conscious brain
• How does the CNS transport impulses?

  As a moving nerve impulse
• What is a synapse?

  Connection between two neurones
• What happens when an electrical impulse hits a nerve?

  It causes the release of chemicals
• What do the released chemicals at a synapse do?

  Deliver a signal to the next nerve cell
• What is the role of sensory neurones?

  Carry information from receptors to the CNS
• What do receptors detect?

  Stimuli or changes in the environment
• What information can sensory neurones carry?

  Changes in temperature or CO2 levels
• What are the characteristics of neurones?

  • Long
  • Thin
  • Branched connections at either end
• How do impulses travel along a neurone?

  Via synapse to the next neurone
• How does the process of impulse transmission repeat between two neurones?

  Electrical impulse triggers chemicals, repeating the process