BIOL 351 | BIOL351 Final Exam: Pharmacology
Updated and Latest Questions and Correct
Answers with Rationale - Portage Learning
1. A patient is prescribed a drug that is known to undergo extensive first-pass metabolism.
Which route of administration would result in the lowest bioavailability for this drug?
A. Intravenous
B. Sublingual
C. Oral
D. Intramuscular
Correct Answer: C
Explanation: Oral administration subjects drugs to first-pass metabolism in the liver via
the portal vein before reaching systemic circulation, significantly reducing bioavailability.
Intravenous and intramuscular routes bypass the GI tract entirely, ensuring higher initial
concentrations. Sublingual administration also bypasses the liver as the drug is absorbed
directly into the systemic venous drainage. This exam assesses comprehensive
pharmacology concepts including pharmacokinetics and safe administration practices.
Understanding these mechanisms is crucial for clinical decision-making and patient safety
in nursing and medical practice.
2. What is the primary mechanism of action for Angiotensin-Converting Enzyme (ACE)
inhibitors in treating hypertension?
A. Antagonizing the AT1 receptors directly
B. Blocking the conversion of Angiotensin I to Angiotensin II
C. Inhibiting the release of renin from the kidneys
D. Promoting the excretion of potassium in the distal tubule
Correct Answer: B
Explanation: ACE inhibitors prevent the conversion of Angiotensin I to the potent
vasoconstrictor Angiotensin II. This leads to vasodilation and decreased aldosterone
secretion. Option B describes ARBs, while ACE inhibitors are known to cause hyperkalemia
rather than potassium excretion.
3. A patient receiving Furosemide (Lasix) for congestive heart failure is at the highest risk for
which electrolyte imbalance?
A. Hyperkalemia
B. Hypernatremia
, C. Hypercalcemia
D. Hypokalemia
Correct Answer: D
Explanation: Furosemide is a loop diuretic that inhibits sodium-potassium-chloride
cotransporters in the thick ascending limb of the Henle loop, leading to significant
potassium loss in the urine. Monitoring for hypokalemia is essential to prevent cardiac
arrhythmias.
4. Which of the following describes the ‘Therapeutic Index’ of a drug?
A. The time required for the plasma concentration to decrease by 50%
B. The maximum effect a drug can produce regardless of dose
C. The amount of drug reaching the systemic circulation
D. The ratio between the lethal dose (LD50) and the effective dose (ED50)
Correct Answer: D
Explanation: The Therapeutic Index (TI) measures drug safety; a narrow TI indicates that
the dose required for effect is close to the dose that causes toxicity. Half-life is A,
bioavailability is C, and efficacy is D.
5. A patient with a history of asthma is admitted for hypertension. Which medication should
the nurse question?
A. Amlodipine
B. Lisinopril
C. Propranolol
D. Hydrochlorothiazide
Correct Answer: C
Explanation: Propranolol is a non-selective beta-blocker that antagonizes both Beta-1 and
Beta-2 receptors. Blocking Beta-2 receptors in the lungs can cause bronchoconstriction,
which is dangerous for patients with asthma.
6. Which medication is the treatment of choice for a patient experiencing an acute
anaphylactic reaction?
A. Diphenhydramine
B. Epinephrine
C. Hydrocortisone
D. Albuterol
Updated and Latest Questions and Correct
Answers with Rationale - Portage Learning
1. A patient is prescribed a drug that is known to undergo extensive first-pass metabolism.
Which route of administration would result in the lowest bioavailability for this drug?
A. Intravenous
B. Sublingual
C. Oral
D. Intramuscular
Correct Answer: C
Explanation: Oral administration subjects drugs to first-pass metabolism in the liver via
the portal vein before reaching systemic circulation, significantly reducing bioavailability.
Intravenous and intramuscular routes bypass the GI tract entirely, ensuring higher initial
concentrations. Sublingual administration also bypasses the liver as the drug is absorbed
directly into the systemic venous drainage. This exam assesses comprehensive
pharmacology concepts including pharmacokinetics and safe administration practices.
Understanding these mechanisms is crucial for clinical decision-making and patient safety
in nursing and medical practice.
2. What is the primary mechanism of action for Angiotensin-Converting Enzyme (ACE)
inhibitors in treating hypertension?
A. Antagonizing the AT1 receptors directly
B. Blocking the conversion of Angiotensin I to Angiotensin II
C. Inhibiting the release of renin from the kidneys
D. Promoting the excretion of potassium in the distal tubule
Correct Answer: B
Explanation: ACE inhibitors prevent the conversion of Angiotensin I to the potent
vasoconstrictor Angiotensin II. This leads to vasodilation and decreased aldosterone
secretion. Option B describes ARBs, while ACE inhibitors are known to cause hyperkalemia
rather than potassium excretion.
3. A patient receiving Furosemide (Lasix) for congestive heart failure is at the highest risk for
which electrolyte imbalance?
A. Hyperkalemia
B. Hypernatremia
, C. Hypercalcemia
D. Hypokalemia
Correct Answer: D
Explanation: Furosemide is a loop diuretic that inhibits sodium-potassium-chloride
cotransporters in the thick ascending limb of the Henle loop, leading to significant
potassium loss in the urine. Monitoring for hypokalemia is essential to prevent cardiac
arrhythmias.
4. Which of the following describes the ‘Therapeutic Index’ of a drug?
A. The time required for the plasma concentration to decrease by 50%
B. The maximum effect a drug can produce regardless of dose
C. The amount of drug reaching the systemic circulation
D. The ratio between the lethal dose (LD50) and the effective dose (ED50)
Correct Answer: D
Explanation: The Therapeutic Index (TI) measures drug safety; a narrow TI indicates that
the dose required for effect is close to the dose that causes toxicity. Half-life is A,
bioavailability is C, and efficacy is D.
5. A patient with a history of asthma is admitted for hypertension. Which medication should
the nurse question?
A. Amlodipine
B. Lisinopril
C. Propranolol
D. Hydrochlorothiazide
Correct Answer: C
Explanation: Propranolol is a non-selective beta-blocker that antagonizes both Beta-1 and
Beta-2 receptors. Blocking Beta-2 receptors in the lungs can cause bronchoconstriction,
which is dangerous for patients with asthma.
6. Which medication is the treatment of choice for a patient experiencing an acute
anaphylactic reaction?
A. Diphenhydramine
B. Epinephrine
C. Hydrocortisone
D. Albuterol
