Adrenergic drugs are similar to or mimic _____ which are _____ SNS neurotransmitters;
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Course
NUR 378
Institution
NUR 378
Adrenergic drugs are similar to or mimic _____ which are _____ SNS neurotransmitters;
Norepinephrine, epinephrine, dopamine
These SNS neurotransmitters are known as... catecholamines
Types of catecholamines endogenous
Synthetic
Endogenous catecholamines dopamine
Epinephrine
(a...
NUR 378 Exam 3 Practice Questions and
Correct Answers
Adrenergic drugs are similar to or mimic _____ which are _____ ✅SNS
neurotransmitters;
Norepinephrine, epinephrine, dopamine
These SNS neurotransmitters are known as... ✅catecholamines
Types of catecholamines ✅endogenous
Synthetic
Endogenous catecholamines ✅dopamine
Epinephrine
(also available in synthetic drug form)
Synthetic catecholamines ✅phenylephrine
MOA dopamine ✅*depends on the dosage*
Stimulates alpha1- and beta1-adrenergic receptors
Alpha1-adrenergic receptors are located at... ✅smooth muscles
Beta1-adrenergic receptors are located at... ✅myocardium
SA node
AV node
Dopamine is a ____-adrenergic ✅beta
Dopamine is a ______ catecholamine ✅naturally occurring
Dopamine at low dosages: ✅dilates blood vessels of:
Brain
Heart
Kidney
, Mesentery
Dopamine at low dosages acts on... ✅dopaminergic receptors
Dopamine at moderate dosages: ✅improves cardiac contractility and output
Dopamine at moderate dosages acts on... ✅beta1-receptors
Dopamine at high dosages: ✅causes vasoconstriction
Dopamine at high dosages acts on... ✅alpha1-receptors
When a beta1-adrenergic receptor is stimulated by an adrenergic drug, what three
things can result? ✅1. Positive inotropic effect
2. Positive chronotropic effect
3. Positive dromotropic effect
Inotropic ✅strength of contraction
Positive inotropic effect example ✅increase in the force of contraction
Chronotropic ✅rate of contraction
Positive chronotropic effect example ✅increase heart rate
Dromotropic ✅heart conductivity
Positive dromotropic effect example ✅increase in conduction of cardiac electrical
nerve impulses through AV node
Epinephrine is an _____ catecholamine ✅endogenous vasoactive
There are also beta1-receptors at the ____ that cause _____ when stimulated
✅kidneys; an increase in renin secretion
MOA epinephrine ✅acts directly on alpha- and beta-adrenergic receptors at tissues
innervated by the SNS
Physiologic response to epinephrine is... ✅dose related
Epinephrine at low dosages: ✅positive inotropic and chronotropic effects
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