ANS Flashcards
ANS Parasymp fibers?
Release what neurotrans?
Long pre-gang from cranial and sacral:
release ACh
Short post-gang near organ:
release ACh
ANS Symp fibers?
Release what neurotrans?
Short pre-gang in thoracic and lumbar:
release ACh
Long post-gang at target:
release NE
ACh released by which fibers? (5)
All pre-gang Parasymp post-gang Symp to sweat glands At adrenal medulla Somatic to mm
Norepi released by which fibers?
Symp post-gang (except sweat glands)
Adrenal medulla
Dopamine released by?
renal vasculature
5 steps in neurotrans fxn?
1) synthesis
2) storage
3) release
4) receptor interaction
5) inactivation
ACh made how?
Choline + Acetyl CoA -> ChAT enz -> ACh
ACh inactivated by?
acetylchoninesterase
Adrenergic (epi) transmission cycle?
Tyrosine into terminal ->
∆ to DOPA then dopamine ->
∆ to NE ->
released to receptors
DOPA synth blocked by?
metyrosine
NE in vesicle depleted by?
reserpine
NE re-uptake blocked by?
cocaine and TCAs
NE release ↑ by?
amphetamines, tyramine
but only if terminal is intact
NE metabolized by?
MAO and COMT
Cholinergic receptors? (4)
M1: sweat glands, CNS
M2: heart, smooth mm, presynaptic
M3: exocrine, smooth mm, endothelium
Nicotinic: Na+ channel, Nn, Nm