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49 Cards in this Set
- Front
- Back
The PNS pre and post synaptic neurons that release ACh
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Cholinergic Neuron
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PNS neuron located on the post-synaptic membrane of the pre-synaptic neuron
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Nicotinic Cholinergic Neuron
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PNS neuron located on the post-synaptic membrane (target tissue) of the post-synaptic neuron
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Muscarinic Cholinergic Neuron
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SNS post-synaptic neuron that releases NE. Pre-synaptic receptor controls release of NE whereas the axon terminal reuptake protein controls removal of NE
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Adrenergic Neuron
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Chemical structures of dopamine, norepinephrine and epinephrine
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Catacholamines
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2 major enzymes that metabolize, break down or inactivate catacholamines
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MAO and COMT
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PNS responses
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Miosis, bradycardia, bronchiocontriction, constriction of gall bladder and urinary bladder, increase GI motility and GI secretions
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SNS responses
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Mydrasis, bronchiodilation, increase cardiac outout, vasoconstriction of renal and mesenteric blood vessels, relaxation of skeletal muscle, relaxation of bladder, decrease GI motility
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Adrenergic Receptors
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Alpha 1- F/F response
Alpha 2- located on the pre-synaptic membrane of the post-synaptic neuron Beta 1- F/F response for Cardiac Beta 2- Passive response |
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Adrenergic receptors on SNS response
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Mydrasis- Alpha 1
Increase cardio output- Beta 1 bronchiodilation- Beta 2 Decrease GI motility- Beta 2 vasoconstriction of renal- Alpha 1 vasodilation of skeletal muscle- Beta 2 relaxation of the bladder- Beta 2 |
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Direct Acting cholinomimetics
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bethanechol, pilocarpine, nicotine and varenicline
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Bethanechol
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MA-Muscarinic cholinergic receptor agonist.
TE-Used in the treatment of GI and bladder paralysis. PT- induce systemic PNS effects |
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Pilocarpine
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MA-Muscarinic cholinergic receptor agonist.
TE- used for the treatment of glaucoma |
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Nicotine
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MA- nicotinic cholinergic receptor agonist
TE- used for the treatment of smoking withdrawl symptoms |
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varenicline
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MA- nicotinic cholinergic partial agonist
TE- helps decrease cravings and pleasure effects of cigarettes |
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Indirect Acting Cholinomimetics
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Neostigmine and Tacrine
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Neostigmine
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MA- acetylcholinesterase inhibitor. ACh accumulates in synapse and produces effect.
TE- used for the treatment of GI and bladder paralysis, gluacoma and mysternia gravis |
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Tacrine
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MA-passes through BBB. ACh enzyme inhibitor. Reverses short term memory by increasing ACh
TE- treatment of symptoms of Alzheimer's disease |
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Cholinolytics
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cholinergic receptor blockers, Suppresses PNS functions.
Atropine and Scopolamine |
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Atropine
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MA- muscarinic cholinergic receptor antagonist.
TE- induces mydrasis, reduces secretions, treatment of bradycardia, treatment of severe diarrhea and bladder incontinence |
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Scopolamine
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MA- muscarinic cholinergic receptor antagonist
TE-used in the treatment of motion sickness. inhibits the cholinergic activation of the emesis center |
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Ganglioinic blockers
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blocks SNS responses.
Trimethaphan |
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Trimethaphan
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MA- nicotinic cholinergic receptor antagonist. (decreases release of NE)
TE- treatment of severe hypertension |
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Skeletal muscle relaxants/anti-spastic drugs
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baclofen and d-tubocurare
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baclofen
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MA- a GABA receptor agonist that suppresses motor neuron activity and nerve conduction
TE- inhibits activity of motor neurons associated with exaggerated reflex activity such as MS |
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d-tubocurare
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MA- nicotinic cholinergic receptor antagonist on skeletal muscle ( blocks excitation-contraction coupling)
TE- induce skeletal muscle relaxation needed during surgery. For tracheal intubations or shock therapy |
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Adrenergics
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alters the biosynthesis of catacholamines.
methyltrosine and L-DOPA |
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Methyltrosine
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MA- inhibits tyrosine hydroxylase
TE-treatment of pheochromocytoma; a tumor of the adrenal medulla, assoc with excessive production of catacholamines and development of severe hypertension |
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L-DOPA
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MA- serves as a substrate for dopamine synthesis
TE- pass through the BBB and elevates dopamine synthesis and reduce tremors and other motor disorders, parkinsonism |
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Generalized sympathomimetics
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not selective for any sub-type of adrenergic receptor.
epinephrine and dopamine |
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Epinephrine
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MA-a Alpha 1 and 2, Beta 1 and 2 adrenergic receptor agonist wich induces F/F responses
TE- induces SNS effects- bronchiodilation, treatment of cardiac arrest |
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Dopamine
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MA-is an agonist for D-1, beta 1 and Alpah 1 adrenergic receptors
TE- cardiogenic shock by acting as a renal D-1 receptor, increases RBF. Beta 1 increases cardiac output |
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Alpha adrenergic receptor sympathomimetics
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phenylephrine, tetrahydralazine and clonidine
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Phenylephrine
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MA-Alpha 1 adrenergic agonist
TE- nasal decongestant by inducing vasoconstiction of bllod vessels in nasal mucosa |
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Tetrahydralazine
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MA- Alpha 1 adrenergic agonist.
TE- used to treat irritation of eyes induced by allergens, smoke or fatigue by inducing vasoconstriction of blood vessels on the surface of the cornea |
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Clonidine
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MA- passes through the BBB and acts as an Alpha 2 AR agonist, reduces the release of catacholimines and SNS tone
TE- used as an antihypertensive drug. |
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Beta Adrenergic receptor sympathomimetics
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mimics NE responses
isoproternal, doputamine and albuterol |
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Isoproternal
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MA-generalized Beta 1 and 2 AR agonist
TE-cardiac stimulant |
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doputamine
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MA- selective beta 1 AR agonist
TE-cardiac stimulant |
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albuterol
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MA- selective Beta 2 AR agonist
TE-used as a bronchiodilator |
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Indirect acting and mixed acting sympathomimetics
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amphetamines and ephedrine
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Amphetamines
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MA-transported into sympathic axon terminal where it displaces catacholimes from internal stores.
TE- CNS stimulant. Treats narcolepsy. Used in children for ADD |
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Ephedrine
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MA- displaces NE from internal stores (slow displacement) and is also an Alpha 1 & Beta 2 AR agonist.
TE- nasal decongestant and bronchiodilator |
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Alpha AR sympatholytics
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Alpha AR blockers
phentolamine and prazosin |
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Phentolamine
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MA-generalized Alpha 1 & 2 AR antagonist
TE-treatment of frost bite and Raynaud's syndrome. Reduces cutaneous vasoconstriction and increases blood flow to the skin |
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Prazosin
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MA-selective Alpha 1 AR antagonist
TE-antihypertensive drug. Redcues peripheral vasoconstriction to renal and mescentric vascular beds |
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Beta AR sympatholytics
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Beta AR blockers
propranolol and metaprolol |
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Propanolol
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MA-generalized Beta 1 & 2 antagonist
TE-prophylactic treatment of migraine headaches that are assoc with vasoconstriction (beta 2 mediated) |
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Metaprolol
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MA- selective Beta 1 antagonist
TE-hypertension, cardiac arrhythmias and ishemic heart disease |