the human nervous system

• what are the two sections of the human nervous system

  the central and peripheral nervous system
• what is the central nervosue sytems composed off

  the brain and spinal cord
• what is the peripheral nervous system composed of


  nerves and ganglia on the outside of the cns
• what is the definition of a stimulus


  A detectable change in the internal or external environment
• what are examples of stimuli


  light heat pain sound
• what is the definition of a receptor cell


  these detect stimuli and convert them into electrical impulses which are sent to the cns via neurones
• how are electrical impulses transported around the body


  neurones
• what is an effector


  these receive electrical impulse from the cns and bring about a response
• what are examples of effectors


  muscles or glans
• what are examples of receptors int he body


  thermoreceptors , osmoreceptors and photoreceptors
• what do thermoreceptors detect


  changes in temperature
• what doe osmoreceptors detect


  changes in water levels
• What do photoreceptors detect?


  light
• what is the order of receptors effectors and stimulus


  first a stimulus then a receptor then an effector