stimuli and responses

• The human nervous system consists of the Central Nervous System and the Peripheral Nervous System.

  CNS- Brain and Spinal Cord

  PNS- Cranial nerves and Spinal nerves
• Functions of the Human Nervous System

  -detects stimuli

  -sends information in the form of impulses

  -interprets impulses

  -produces responses
• Voluntary actions are conscious actions and conducted under one's will. Voluntary actions are controlled by the brain. E.g. walking, talking, and thinking.

  
  

  Stimulus --> Affector(recepter) --> Brain --> Effector --> Response
• Involuntary Actions occur without conscious control.

  Involving medulla oblongata-

  • Breathing
  • Peristalsis
  • Secretion of saliva
  • Heartbeat

  Involving spinal cord(reflex actions)-

  • Sneezing
  • withdrawing hand when it touches a hot object