Autonomic Nervous System

Autonomic Nervous System: regulates involuntary activities ie. Heart and smooth muscle Two divisions:

  • Sympathetic> fight or flight, tachycardia, raise BP, nervousness. Epinephrine and Norepinephrine
  • Parasympathetic> calm down, nausea, vomiting, fainting, abdominal distress
    • Acetylcholine
    • Alpha receptors – vasoconstriction
    • Beta1 – increase heart rate and strength of contraction
    • Beta2 – bronchodilators


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