the nervous system

• the nervous system

  Central nervous system (CNS) - brain and the spine

  peripheral nervous system (PNS) - rest of the body

  • Semitic nervous system (SNS) - associated with voluntary movement, impulse is 2 directional
  • autonomic nervous system (ANS) - regulates involuntary body systems or movement, fight or flight

  - sympathetic nervous system (SNS) - increases energy, fight or flight

  - parasympathetic nervous system (PNS) - conserves energy, rest and digest
• involuntary functions (sympathetic and parasympathetic response)

  • heart rate - SNS: increases, PNS: decreases
  • blood pressure - SNS: increases, PNS: decreases
  • sweating - SNS: increases, PNS: decreases
  • digestion - SNS: decreases, PNS: increases
  • salivation - SNS: decreases, PNS: increases