MEDSCI303 | MEDSCI303 Pharmacy Exam 2
Version 1 | Questions with Correct Answers and
Expert Explanation for Each Question | Rajiv
Gandhi University of Health Sciences
1. Which neurotransmitter is primarily responsible for signal transmission in the
parasympathetic nervous system?
A. Serotonin
B. Norepinephrine
C. Dopamine
D. Acetylcholine
Correct Answer: D
Expert Explanation: Acetylcholine is the key neurotransmitter for the
parasympathetic division of the autonomic nervous system. It is synthesized from
choline and acetyl-CoA within the nerve terminal. Once released, it acts on both
muscarinic and nicotinic receptors to mediate body functions. Its action is
terminated by the enzyme acetylcholinesterase in the synaptic cleft. This system is
often referred to as the rest and digest system of the body.
2. What is the primary mechanism of action for the drug Atropine?
A. Beta-adrenergic agonist
,B. Nicotinic receptor agonist
C. Muscarinic receptor antagonist
D. Alpha-adrenergic blocker
Correct Answer: C
Expert Explanation: Atropine is a competitive antagonist at muscarinic
acetylcholine receptors. By blocking these receptors, it prevents the effects of the
parasympathetic nervous system. This results in clinical effects such as pupil
dilation and increased heart rate. It is commonly used to treat bradycardia and
organophosphate poisoning. Healthcare providers must monitor patients for side
effects like dry mouth and urinary retention.
3. Bethanechol is clinically indicated for which of the following conditions?
A. Hypertension
B. Non-obstructive urinary retention
C. Glaucoma
D. Asthma attack
Correct Answer: B
Expert Explanation: Bethanechol is a direct-acting muscarinic agonist that
stimulates the parasympathetic nervous system. It is primarily used to treat non-
,obstructive urinary retention by stimulating the detrusor muscle. By increasing
muscle tone, it helps the bladder to contract and expel urine. Patients with
mechanical obstructions of the bowel or bladder should avoid this medication. It is a
stable analog of acetylcholine that is not easily degraded by acetylcholinesterase.
4. A common side effect of non-selective beta-blockers like Propranolol is:
A. Tachycardia
B. Hypertension
C. Bronchoconstriction
D. Mydriasis
Correct Answer: C
Expert Explanation: Non-selective beta-blockers like propranolol antagonize both
beta-1 and beta-2 adrenergic receptors. Blocking beta-2 receptors in the lungs can
lead to significant bronchoconstriction. This effect is dangerous for patients with
pre-existing conditions like asthma or COPD. Therefore, selective beta-1 blockers
are preferred for patients with respiratory issues. Pharmacists must always screen
for respiratory history before dispensing these medications.
5. Which neurotransmitter is released by most postganglionic sympathetic nerve
fibers?
A. Glutamate
, B. Acetylcholine
C. GABA
D. Norepinephrine
Correct Answer: D
Expert Explanation: Norepinephrine is the primary neurotransmitter released by
postganglionic sympathetic nerve endings. It acts mainly on alpha-1 and beta-1
adrenergic receptors to increase blood pressure. It is synthesized from dopamine
through the action of dopamine beta-hydroxylase. After its release, it is primarily
removed from the synapse via neuronal reuptake. Understanding its pathway is
crucial for managing patients in shock.
6. What is the primary clinical use of Albuterol (Salbutamol)?
A. Lowering blood pressure
B. Relieving acute bronchospasm
C. Treating constipation
D. Inducing sleep
Correct Answer: B
Expert Explanation: Albuterol is a short-acting beta-2 adrenergic agonist used for
its bronchodilatory effects. It stimulates beta-2 receptors on bronchial smooth
Version 1 | Questions with Correct Answers and
Expert Explanation for Each Question | Rajiv
Gandhi University of Health Sciences
1. Which neurotransmitter is primarily responsible for signal transmission in the
parasympathetic nervous system?
A. Serotonin
B. Norepinephrine
C. Dopamine
D. Acetylcholine
Correct Answer: D
Expert Explanation: Acetylcholine is the key neurotransmitter for the
parasympathetic division of the autonomic nervous system. It is synthesized from
choline and acetyl-CoA within the nerve terminal. Once released, it acts on both
muscarinic and nicotinic receptors to mediate body functions. Its action is
terminated by the enzyme acetylcholinesterase in the synaptic cleft. This system is
often referred to as the rest and digest system of the body.
2. What is the primary mechanism of action for the drug Atropine?
A. Beta-adrenergic agonist
,B. Nicotinic receptor agonist
C. Muscarinic receptor antagonist
D. Alpha-adrenergic blocker
Correct Answer: C
Expert Explanation: Atropine is a competitive antagonist at muscarinic
acetylcholine receptors. By blocking these receptors, it prevents the effects of the
parasympathetic nervous system. This results in clinical effects such as pupil
dilation and increased heart rate. It is commonly used to treat bradycardia and
organophosphate poisoning. Healthcare providers must monitor patients for side
effects like dry mouth and urinary retention.
3. Bethanechol is clinically indicated for which of the following conditions?
A. Hypertension
B. Non-obstructive urinary retention
C. Glaucoma
D. Asthma attack
Correct Answer: B
Expert Explanation: Bethanechol is a direct-acting muscarinic agonist that
stimulates the parasympathetic nervous system. It is primarily used to treat non-
,obstructive urinary retention by stimulating the detrusor muscle. By increasing
muscle tone, it helps the bladder to contract and expel urine. Patients with
mechanical obstructions of the bowel or bladder should avoid this medication. It is a
stable analog of acetylcholine that is not easily degraded by acetylcholinesterase.
4. A common side effect of non-selective beta-blockers like Propranolol is:
A. Tachycardia
B. Hypertension
C. Bronchoconstriction
D. Mydriasis
Correct Answer: C
Expert Explanation: Non-selective beta-blockers like propranolol antagonize both
beta-1 and beta-2 adrenergic receptors. Blocking beta-2 receptors in the lungs can
lead to significant bronchoconstriction. This effect is dangerous for patients with
pre-existing conditions like asthma or COPD. Therefore, selective beta-1 blockers
are preferred for patients with respiratory issues. Pharmacists must always screen
for respiratory history before dispensing these medications.
5. Which neurotransmitter is released by most postganglionic sympathetic nerve
fibers?
A. Glutamate
, B. Acetylcholine
C. GABA
D. Norepinephrine
Correct Answer: D
Expert Explanation: Norepinephrine is the primary neurotransmitter released by
postganglionic sympathetic nerve endings. It acts mainly on alpha-1 and beta-1
adrenergic receptors to increase blood pressure. It is synthesized from dopamine
through the action of dopamine beta-hydroxylase. After its release, it is primarily
removed from the synapse via neuronal reuptake. Understanding its pathway is
crucial for managing patients in shock.
6. What is the primary clinical use of Albuterol (Salbutamol)?
A. Lowering blood pressure
B. Relieving acute bronchospasm
C. Treating constipation
D. Inducing sleep
Correct Answer: B
Expert Explanation: Albuterol is a short-acting beta-2 adrenergic agonist used for
its bronchodilatory effects. It stimulates beta-2 receptors on bronchial smooth
