L1.3.3.2.2 Physiology of ANS Divisions

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Created by
Ayen B.

Cards (4)

  • PHYSIOLOGY OF ANS DIVISIONS
    ● Body organs served by the ANS receive fibers from both divisions
    ● Exceptions:
    ○ Blood vessels
    ○ Structures of the skin
    ○ Some glands
    ○ Adrenal medulla (they only receive sympathetic fibers)
  • PHYSIOLOGY OF ANS DIVISIONS
    ● When body divisions serve the same organ, they cause antagonistic effects due to different neurotransmitters
    ○ PARASYMPATHETIC CHOLINERGIC FIBERS - release acetylcholine
    ○ SYMPATHETIC POSTGANGLIONIC FIBERS - release adrenergic
    ○ Preganglionic axons of both divisions release acetylcholine
  • PARASYMPATHETIC DIVISION
    ● “rest-and-digest division”
    ● Conserves energy
    ● Maintains daily necessary body functions
    ● “D division”
    ○ Digestion
    ○ Defecation
    ○ Diuresis
  • SYMPATHETIC DIVISION
    ● ”fight-or-flight division”
    ● Response to unusual stimulus when emotionally or physically stressed or threatened
    ● Takes over to increase activities
    ● “E division”
    ○ Exercise
    ○ Excitement
    ○ Emergency
    ○ Embarrassment