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46 Cards in this Set
- Front
- Back
the adrenal medulla mainly releases __________
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epinephrine
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__________ is the enzyme that converts NE to Epi in the adrenal medulla
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PNMT
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does epi or norepi bind better to beta2 receptors?
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epi
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Epi in low doses _______ PVR, and _________ PVR in high doses
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decreases, increases
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ACh diffuses into the blood stream where it is broken down into Choline and acetate by the enzyme ____________
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Butyryl Cholinesterase
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______________ is released from parasympathetic nerve terminals and binds to ______ and ________ receptors
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ACh; M and N
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What is the main method for ACh inactivation?
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Acetylcholinesterase located in synaptic cleft
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Where are N receptors?
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PS ganglia, S ganglia, Skeletal m.
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Where are M receptors located?
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glands, smooth m., organs (heart, kidney, intestines, etc)
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G___ activates adenyl cyclase
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s
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G__ inhibits adenylyl cyclase
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i
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G__ activates phospholipase Cbeta
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q
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alpha1 receptors are associated with which G-protein?
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Gq
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PLCbeta activation causes _______ IP3, _______ PKC and ______ Ca2+
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increased; increased; increased
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What effect do alpha1 agonists have on BP?
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increase
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alpha2 receptors are associated with which G-protein?
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Gi
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alpha2 receptor agonists have what effect on neurotransmitter release? K+ permeability?
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decrease; increase
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beta receptors are associated with which G-protein?
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Gs
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What is the effect of beta1 receptor agonists on kidneys and heart?
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increased renin release; increased HR and force of contraction
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What is the effect of beta2 receptor agonists on smooth m. and liver?
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relaxation; glycogenolysis/gluconeogenesis
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What is the effect of beta3 receptors on adipose tissue?
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lipolysis
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M3 receptors are located on _______ and ___________ and activate G_____
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smooth m; secretory glands; q
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Where are M2 receptors located? Which G-protein do they activate?
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heart; Gi
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chronic exposure to an antagonist causes receptor ___________
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upregulation
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What are two ways to induce mydriasis using autonomic mimetics?
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Block M receptors, Activate alpha1 receptors
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What type of autonomic receptors are on the ciliary m.?
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M3
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m receptor agonists cause the ciliary m. to __________ allowing for ________ vision
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contract; near
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What would you give to a patient to dilate the pupil and avoid the effect of blurry vision?
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alpha1 agonist
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What endogenous catecholamine is most likely to bind to beta2 receptors on the lungs?
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Epi
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What type of M receptors are found in the lungs? what effects do their agonists have?
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M3; bronchoconstriction and mucus secretion
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What type of drug would be considered a physiological antagonist of bronchoconstriction?
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B2 agonist
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M3 receptor agonists in the stomach cause what?
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acid secretion
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Which receptors are activated to cause detrusor m. contraction?
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M
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Which receptors are activated to cause urinary sphincter constriction?
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alpha1
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stimulation of _____ causes ejaculation
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alpha1
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__________ stimulation causes erection
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parasympathetic
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Activation of M3 receptors on endothelial walls results in?
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NO release and vasodilation
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What effect does parasympathetic activation have on PVR?
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none
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liver and skeletal m. blood vessels have mainly ____ adrenergic receptors
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beta2
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Parasympathetic stimulation to the heart _________ HR, _________ force of contraction (atrial) and ________ conduction velocity
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decrease; decrease; decrease
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Sympathetic stimulation to the heart activates beta__ receptors
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1
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Stimulation of which type of receptor will produce the greatest increase in cardiac output?
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beta1
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What is one of the most bothersome side effects of blocking muscarinic receptors?
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dry mouth
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What may be a consequence of blocking beta receptors in a diabetic?
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impair response to hypoglycemia
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activation of alpha2 receptors on pancreas ________ insulin release
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decreases
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activation of beta2 receptors on skeletal m. shifts K+ _______ the cell
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into
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