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ANS Receptors (Adrenergic & Cholinergic (Adrenergic (both excitatory…

- - - - released by postganglionic parasympathetic axons usually excitatory, sometimes inhibitory
      - released by somatic motor neurons and preganglionic autonomic neurons always have excitatory effect
- - - - type of Cholinergic receptor
    - - causes muscle contraction in skeletal muscles
      - causes activation postganglionic neurons
  - - - Cholinergic receptor
      - parasympathetic
- - - - promotes relaxation of smooth muscles, increases force of contraction of cardiac muscle, promotes increase in heart rate
      - norepinephrine from postganglionic neurons in synpathetic division
    - - increased heart rate and contractility
    - - dilation of bronchioles and blood vessels
      - promote vasodilation in appropriate organs to prepare body for physical exertion
  - - - causes stimulation of smooth muscles
      - vasoconstrictor effect of sympathetic nerves
      - rise in cytoplasmic concentration of Ca2+ -> second messenger system
    - - vasoconstriction in viscera and skin
      - stimulated by norepinephrine from postganglionic neuron in sympathetic division
    - - presynaptic terminal boutons
      - produce decreased release of norepinephrine
      - most important located in brain