structure

• • the nervous system allows humans to react their surroundings and coordinate their behaviour
• • muscles are an effector - they contract in response to a nervous impulse
  • glands are an effector - they secrete hormones
• • the central nervous system is the brain and the spinal cord in humans
  • it is connected to the body through sensory and motor neurones
  • the CNS coordinates the response of effectors
• • sensory neurones are neurones that carry information as electrical impulses from receptors to the CNS
• • motor neurones are neurones that carry information as electrical impulses from the CNS to effectors
• stimulus -> receptor -> coordinator -> effector -> response