The Nervous System

• What is the Nervous system ?

  • detects & reacts to stimuli, made up of different parts
  • humans can react to their surroundings & coordinate their behaviour.
• Vertebrates

  • Consists of the brain & spinal cord ONLY
• Central nervous system

  • Coordinates the response
• What are sensory neurones?

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


  • Carry electrical impulses from CNS to the effector
• What do Receptors & Effectors do?


  Forms part of complex organs
• Types of receptors

  • Taste receptors on the tongue
  • Sound receptors of the ears
• Muscles contract


  in response to nervous impulse
• Glands

  secrete hormones
• What do neurones do?

  • Transmit Information to & from the brain
• What is CNS connected to in Mammals?


  • CNS is connected to body by sensory & motor neurones