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- Sometimes referred to as the "fight or flight" system, this system kicks in when there is imminent danger.
- Whole body will be stimulated, ready for action

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Parasympathetic Nervous System (Cholinergic) 

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Parasympathetic Nervous System (Cholinergic) 

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Sometimes referred to as the "rest and digest" system, this system is your default setting when your body is relaxed.

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Sympathetic:
ACH - released at ganglia from presynaptic nerve endings
EPI - targets adrenergic receptors
NE - released at postganglionic nerve endings
DA - stimulates many receptors (alpha, beta, dopaminergic)
Parasympathetic:
ACH - released at ganglia from presynaptic nerve endings

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Sympathetic:
epinephrine, norepinephrine, acetylcholine, and dopamine
Parasympathetic:
acetylcholine

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Alpha 1 adrenergic agonists -
ephedrine-increases BP

phenylephrine (Neo-Synephrine®)- nasal decongestant
epinephrine (Adrenalin®)

Alpha 1 blocking -
prazosin (Minipress®)-HTN

terazosin (Hytrin®) -HTN, BPH

doxazosin (Cardura®)-HTN, BPH

Beta 1 adrenergic agonists -
dobutamine
Beta 2 adrenergic agonists -
albuterol (Proventil®, Ventolin®)-bronchodilator

terbutaline (Brethine®)-bronchodilator, uterine relaxant

formoterol (Foradil®)-bronchodilator

salmeterol (Serevent®)-bronchodilator

Beta blocking  -
Selective:
atenolol (Tenormin®)

metoprolol (Lopressor®)
Non-Selective:
nadolol (Corgard®)

propanolol(Inderal®)

timolol (Blocadren®)