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Physiology !!!

Transmitters and Receptors

QuestionAnswer
Fibers (or synapses) are Adrenegeric or cholineric
Most postgang sympathetic fibers adrenegeric Rest (including all pregang sympathetic, all parasympathetic, and a few postgang sympathetic) are cholinergic
Cholingeric receptors are 1.muscarinic 2. nicotinic
What blocks muscarinic receptors? atropine
muscarinic (at postgang effectors for all parasympathetic and those few cholinergic sympathetic)
At all ganglionic synapses (ends of pregang fibers) Also type at skeletal muscle neuromuscular junctions (Curare blocks these) Nicotinic
Adrenergic receptors are Alpha(a) or beta(b)
Alpha(a) causes vasoconstriction in peripheral blood vessels
Beta(b) causes Vasodilation
Norepinephrine Mainly A
Epinephrine A&B
Adrenergic Receptor Subtypes A1 & A2 Both cause decrease in cAMP production; A1 may cause increase in intracellular Ca++ - usually excitatory
Adrenergic Receptor Subtypes B1 & B2 Both increase cAMP production - usually inhibitory
Created by: k.mckinley1991
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