E.5b Brain Function

Explain sympathetic and parasympathetic control of the heart, movements of the iris, and flow of blood to the gut.

autonomic nervous system:

  • sympathetic:
    • fight-flight-excercise
  • parasympathetic:
    • restorative, resting, digesting


  • sympathetic:
    • heart rate accelerates, pumping more blood to muscles
  • parasympathetic:
    • heart rate slows, body relaxes, less blood needed to muscles

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