The neurones

• Parts of CNS

  • Brain
  • Spinal cord
• Sensory neurones


  Carry information as electrical impulses from the receptors to the CNS
• Motor neurones

  Carry electrical impulses from the CNS to effectors
• Effectors

  All your muscles and glands, which respond to nervous impulses
• CNS

  • Coordination centre - it receives information, coordinates and sends out impulses
• CNS in vertebrates

  • Connected to the body by sensory neurones and motor neurones
• Effectors

  Respond to nervous impulses and bring about a change
• 1. receptor detects the stimuli
  2. effector responds to the nervous impulses and bring about a change
  3. muscles and glands contract and secrete hormones
• how the central nervous system works

  cns coordinates a response

  1. receptor is stimulated
  2. sensory neurones send info from receptor to cns
  3. cns decides
  4. cns sends info back to muscles or glands to the effector along the motor neurone
• Control systems

  • Maintain body temperature
• Central Nervous System

  In your back, the brain and spinal cord make up the central nervous system
• Main components of automatic control systems

  • Receptors
  • Coordination centres
  • Effectors
• Effectors will continue producing responses as long as instructed by the coordination centre, which may lead to the level changing too much. Receptors detect this and negative feedback starts again
• Some effectors help to control body temperature.

  give one reason why it is important to control body temp

  so chemical reactions are faster