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WorksheetsAutonomic Nervous System Pre Quiz
Total questions: 10
Worksheet time: 3mins
Which neurotransmitter is the primary mediator at all preganglionic autonomic synapses?
Norepinephrine
Dopamine
Acetylcholine
Epinephrine
Muscarinic receptor stimulation at the heart typically produces which effect?
Tachycardia
Bradycardia
Increased contractility
Coronary vasoconstriction
A patient receives atropine before anesthesia. Which physiologic effect MOST likely results?
Reduced sympathetic tone
Inhibition of nicotinic receptors at neuromuscular junctions
Blockade of muscarinic receptors → tachycardia
Enhanced release of norepinephrine from presynaptic terminals
Which receptor subtype mediates vasoconstriction in most vascular smooth muscle?
β1
β2
α1
α2
During a ganglionic nicotine challenge, a patient first experiences hypertension and tachycardia, followed by hypotension and weakness. This represents:
Muscarinic blockade
Nicotinic receptor stimulation then blockade
α1 receptor antagonism
β2 receptor stimulation
Which second messenger system is activated by β-adrenergic receptors?
Phospholipase C → IP3/DAG
Adenylyl cyclase → cAMP
Tyrosine kinase → MAPK
Guanylyl cyclase → cGMP
A patient on chronic β-blocker therapy undergoes anesthesia. Which autonomic change is MOST expected?
Enhanced baroreceptor sensitivity
Blunted heart rate response to hypotension
Exaggerated bronchodilation response
Increased renin release
Which statement is TRUE regarding adrenal medulla innervation?
It is controlled by postganglionic sympathetic fibers.
Preganglionic sympathetic fibers release norepinephrine.
Preganglionic sympathetic fibers release acetylcholine onto chromaffin cells.
Adrenal medulla primarily releases acetylcholine into the blood.
An anesthetized patient develops severe bradycardia after opioid administration. Which autonomic mechanism explains this?
Enhanced sympathetic output
Increased vagal (parasympathetic) tone at muscarinic receptors
Blockade of α2 adrenergic receptors
Inhibition of nicotinic ganglionic transmission
A patient with Horner's syndrome (miosis, ptosis, anhidrosis) most likely has damage to which autonomic pathway?
Parasympathetic cranial nerve III fibers
Sympathetic pathway from hypothalamus to superior cervical ganglion
Somatic motor pathway to eyelid muscles
Presynaptic muscarinic receptor in the myocardium
