Which step limits acetylcholine synthesis in cholinergic nerve terminals?

Choline uptake via high-affinity CHT1

Conversion of tyrosine to DOPA by tyrosine hydroxylase

Acetylation of choline catalyzed by choline acetyltransferase (ChAT)

Hydrolysis of acetylcholine by vesicular acetylcholinesterase

How does bethanechol relieve postoperative non-obstructive urinary retention?

Muscarinic M3 agonism: detrusor contraction and trigone relaxation

Direct non-depolarizing blockade of nicotinic neuromuscular junction receptors

Irreversible covalent carbamylation of synaptic acetylcholinesterase enzymes

Selective stimulation of vascular alpha-1 adrenergic receptors

Why was edrophonium used in the Tensilon test for myasthenia gravis?

Rapid onset and brief action allow transient improvement to be observed

Providing long-term maintenance therapy for autoimmune myasthenia gravis

Overcoming central muscarinic receptor blockade in organophosphate poisoning

Producing sustained neuromuscular depolarization during surgical endotracheal intubation

How does pralidoxime (2-PAM) act in organophosphate poisoning?

Reactivates acetylcholinesterase by attacking its phosphorylated serine

Direct physiological antagonism of excessive sympathetic postganglionic discharge

Inhibition of presynaptic choline acetyltransferase to suppress acetylcholine synthesis

Competitive antagonist blockade at postjunctional muscarinic M2 receptors

What effects do atropine eye drops produce?

Miosis and spasm of accommodation

Selective decrease in episcleral venous pressure without pupil dilation

Rapid constriction of the pupillary dilator muscle

What is the main use of benztropine?

Drug-induced extrapyramidal symptoms and secondary Parkinsonism

Paroxysmal supraventricular tachycardia

What happens when presynaptic alpha-2 receptors are activated?

Inhibits norepinephrine release via Gi, lowering cAMP and Ca2+ influx

Enhanced exocytic release of norepinephrine via Gs-adenylyl cyclase coupling

Direct phosphorylation of postsynaptic beta-1 adrenergic receptors

Immediate activation of the adrenal chromaffin catecholamine synthesis cascade

Which receptor mediates dobutamine's positive inotropic effect in cardiogenic shock?

Cardiac Beta-1 adrenergic receptor

Pulmonary Beta-2 adrenergic receptor

Vascular Alpha-1 adrenergic receptor

Presynaptic Alpha-2 adrenergic receptor

What causes prazosin's first-dose hypotension and syncope?

Alpha-1 blockade causes venous pooling and reduced cardiac output

Direct functional antagonism of cardiac beta-1 receptors in the SA node

Profound vagal cardiac arrest driven by central muscarinic hyperactivation

Immediate exhaustion of vesicular norepinephrine stores in adrenergic nerve endings

Why are non-selective beta-blockers contraindicated in asthma?

Blocks bronchial beta-2 receptors, causing unopposed bronchoconstriction

They induce mast cell degranulation by direct cross-linking of surface IgE

They downregulate central respiratory pacemaker neurons in the medulla

They stimulate bronchial alpha-1 receptors to promote mucosal transudation

Which property makes esmolol useful for emergency rate control?

RBC esterase hydrolysis gives an ultrashort half-life (~9 min)

Rapid biliary clearance with a 24-hour biological half-life

High lipid solubility with immediate sequestration into neural adipose tissues

Active tubular secretion that is uninhibited by renal insufficiency

Which drug is first-line for emergency treatment of anaphylactic shock?

Intramuscular Epinephrine (Adrenaline)

How does clonidine lower blood pressure?

Selective stimulation of central presynaptic and postsynaptic Alpha-2 receptors and imidazoline I1 receptors

Irreversible competitive inhibition of postjunctional vascular Beta-2 receptors

Competitive inhibition of vascular endothelin-1 type A receptors

Direct non-selective blockade of vascular L-type voltage-gated calcium channels

What can occur if long-term clonidine is stopped abruptly?

Rebound hypertensive crisis accompanied by sympathetic hyperarousal

Profound hypokalemic flaccid paralysis

Severe paralytic ileus and acute urinary retention

Acute bilateral adrenal cortical necrosis

How does pilocarpine help in acute angle-closure glaucoma?

Sphincter contraction (miosis) pulls iris away and opens the angle

Direct osmotic drawing of water from the posterior chamber into systemic circulation

Blockade of beta-adrenergic receptors on the ciliary body to reduce carbonic anhydrase activity

Stimulation of ciliary epithelial alpha-2 receptors to suppress aqueous humor formation

Which sign is typical of acute organophosphate poisoning?

Pinpoint miosis, salivation, lacrimation and bronchospasm

Mydriasis with dry skin and urinary retention

Flaccid paralysis with hyperthermia and dry mucous membranes

Paroxysmal ventricular tachycardia with cutaneous flushing

What cataract-surgery complication is associated with tamsulosin?

Permanent retrobulbar optic neuropathy

Central retinal vein thrombosis

Acute malignant hyperthermia of the orbit

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RRB PH UT10 – Pharmacology Practice Test 10: Autonomic Nervous System (ANS)

Rohan Joshi November 5, 2026 9 views 30 Questions

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About This Practice Test
This 30-question online practice test reviews core autonomic nervous system (ANS) pharmacology for pharmacy and paramedical competitive examinations. Topics include cholinergic neurotransmission, anticholinesterases and antidotes, muscarinic antagonists, sympathomimetic drugs, alpha-blockers, and beta-blockers. The questions are designed to reinforce drug–receptor mechanisms, key clinical uses, adverse effects, and important drug interactions. Use this test as a practice resource alongside the applicable syllabus and current clinical guidance; it is not a substitute for official exam notifications or clinical protocols.

Syllabus Covered
• Cholinergic Pharmacology: Acetylcholine synthesis, bethanechol, pilocarpine, and muscarinic receptor subtypes.
• Anticholinesterases and Antidotes: Neostigmine, physostigmine, edrophonium (historical Tensilon test), and pralidoxime (2-PAM) for organophosphate poisoning.
• Anticholinergics: Atropine and ocular effects, glycopyrrolate, tiotropium bromide, and benztropine.
• Adrenergic Agonists and Autoreceptors: Epinephrine in anaphylaxis, dobutamine, salbutamol, and the alpha-2 agonists clonidine and methyldopa.
• Alpha-Blockers: Phenoxybenzamine, Dale’s vasomotor reversal, prazosin-associated first-dose hypotension, and tamsulosin-associated intraoperative floppy iris syndrome (IFIS).
• Beta-Blockers: Non-selective and beta-1-selective agents (including propranolol and metoprolol), esmolol clearance, pindolol and intrinsic sympathomimetic activity (ISA), and carvedilol’s mixed alpha/beta blockade.

Applicable Examinations
• RRB Paramedical / Pharmacist recruitment examinations.
• DSSSB Pharmacist and ESIC recruitment examinations.
• AIIMS paramedical and CGHS-related recruitment examinations, where the relevant syllabus applies.
• State PSC, Directorate of Medical Education (DME), and state pharmacy recruitment examinations.

Test Instructions and Features
30 questions | Timed online test | Explanations for each question | Instant scorecard and performance analysis