ANS receptors/neurotransmitters Flashcards
cause increase in production of aqueous humor, increasing intraocular pressure
beta receptors
constrict blood vessels in the skin and skeletal muscle
a1 receptors
promote ejaculation
a1 receptors
alpha and beta receptors bind
norepinephrine
alpha 1 acts on
Gq
increased salivary and lacrimal gland secretions
M1 and M3 receptors
Gq pathway
activates phospholipase C, producing IP3 and DAG, which causes Ca++ increase and activation of protein kinases
nicotinic subtype found on postganglionic neurons and presynaptic terminals
Nn
relax the bronchioles
B2 receptors
contract the urinary sphincter
a1 receptors
D1 pathway
stimulates adenylyl cyclase
voluntary motor neurons are:
cholinergic
most post-ganglionic sympathetic neurons are
noradrenergic
nerves innervating the adrenal medulla are
cholinergic
post-ganglionic sympathetics to renal vasculature release
dopamine
promote erection
M3 receptors
most post-ganglionic sympathetic neurons release
norepinephrine
all pre-ganglionic receptors are
nicotinic
accommodation of the lens for near vision
M3 receptors
nicotinic subtype found at neuromuscular junction of skeletal muscle
Nm
voluntary motor neurons release
acetylcholine
decreases ocular pressure by unknown mechanism
alpha receptors
Relax sphincters allowing for defecation
M3 receptors
the adrenal cortex releases
epinephrine and norepinephrine
post-ganglionic sympathetic receptors on renal vasculature are
D1
nerves innervating the adrenal medulla release
acetylcholine
all beta receptors act on
Gs
all post-ganglionic parasympathetic receptors are
muscarinic
most post-ganglionic sympathetic receptors are
alpha or beta
M1 acts on
Gq
cause bronchoconstriction and increase mucous secretion in the lung
M3 receptors
M3 acts on
Gq
post-ganglionic sympathetic neurons innervating sweat glands are
cholinergic
somatic skeletal muscle receptors are
nicotinic
muscarinic receptors bind
acetylcholine
relax base of bladder and urinary sphincter
M3 receptors
increase heart rate, AV conduction, and contractility
B1, some B2 receptors
constriction of nasal blood vessels, decreasing congestion
a1 receptors
presynaptic receptors on cholinergic nerve terminals that decrease ACh release
M2 receptors
relax blood vessels in skeletal muscle
B2 receptors
slow the heart, decrease SA node activity, and AV conduction
M2 receptors
post-ganglionic sympathetic neurons innervating sweat glands release
acetylcholine
cause miosis
M3 receptors
all pre-ganglionic neurons are
cholinergic
baroreceptor response for reflex bradycardia is mediated by
M2 receptors
relax the pregnant uterus
B2 receptors
nicotinic receptors bind
acetylcholine
increases gastric acid secretions, stimulate contraction of GI tract wall, increase motility
M3 receptors
alpha 2 acts on
Gi
Gi pathway
inhibits adenylyl cyclase, decreasing cAMP. opens K+ channels→ hyperpolarizing neurons
post-ganglionic sympathetic receptors on sweat glands are
muscarinic
increase activity of apocrine and salivary glands
a1 receptors
cholinergic neurons release
acetlycholine
all pre-ganglionic neurons release
acetylcholine
relax walls of GI tract
a2 and B2 receptors
Gs pathway
stimulate adenylyl cyclase to increase cAMP
contraction of the ciliary muscle and constriction of the pupil by __________ widens space in trabecular meshwork and allows aqueous humor to drain
parasympathetic stimulation (M3)
contract bladder wall
M3 receptors
all receptors in ganglion
nicotinic
relax the urinary bladder
B3 receptors
all post-ganglionic parasympathetic neurons are
cholinergic
increase sweating
M3 sympathetic receptors
presynaptic receptors on noradrenergic nerve terminals that decrease norepinephrine release
a2 receptors
M2 acts on
Gi
receptors in the adrenal medulla
nicotinic
mydriasis
a1 receptors
