West Coast University NURS180 Week 3 Quiz (pdf) |
2026/2027 | Pharmacology Q&A | Nursing
1. What is the term used to describe the study of what the body does to a drug?
A) Pharmacodynamics
B) Pharmacognosy
C) Pharmacotherapeutics
D) Pharmacokinetics
Correct Answer: Pharmacokinetics
Rationale: Pharmacokinetics encompasses the processes of absorption, distribution, metabolism, and
excretion, describing how the body affects a drug over time. Pharmacodynamics, by contrast,
describes what the drug does to the body. The other options refer to different aspects of
pharmacology unrelated to drug movement and transformation.
2. Which process involves the movement of a drug from its site of administration into the
bloodstream?
A) Distribution
B) Metabolism
C) Absorption
D) Excretion
Correct Answer: Absorption
Rationale: Absorption is defined as the movement of a drug from its site of administration into the
systemic circulation. Distribution follows absorption and involves the movement of drug from blood
to tissues. Metabolism and excretion occur after the drug has entered the bloodstream and are not
the initial transfer process.
3. The first-pass effect refers to the metabolism of a drug in which organ before it reaches
systemic circulation?
A) Lungs
B) Liver
C) Kidneys
D) Small Intestine
Correct Answer: Liver
Rationale: Orally administered drugs are absorbed through the gastrointestinal tract and transported
via the portal vein directly to the liver, where extensive metabolism may occur before the drug
reaches the systemic circulation. This hepatic first-pass metabolism can significantly reduce the
bioavailability of oral medications. The lungs, kidneys, and small intestine do not serve as the primary
site for this presystemic elimination.
, 4. Which route of administration provides 100% bioavailability?
A) Oral
B) Subcutaneous
C) Intramuscular
D) Intravenous
Correct Answer: Intravenous
Rationale: Intravenous administration delivers the drug directly into the bloodstream, bypassing
absorption barriers and the first-pass effect, thereby making the entire dose available to the systemic
circulation. Oral drugs undergo absorption and first-pass metabolism, reducing bioavailability.
Subcutaneous and intramuscular routes require absorption from tissue sites before reaching
circulation.
5. What occurs when a drug binds to a receptor and produces a maximal biological response?
A) Antagonist activity
B) Partial agonist activity
C) Agonist activity
D) Enzyme induction
Correct Answer: Agonist activity
Rationale: An agonist is a drug that binds to a receptor and activates it to produce a physiological
response, mimicking the action of endogenous regulatory molecules. Antagonists bind to receptors
but do not activate them, blocking the effects of agonists. Partial agonists produce a submaximal
response, and enzyme induction is unrelated to receptor binding.
6. A patient has low serum albumin levels. How might this affect a highly protein-bound drug?
A) Decreased drug effectiveness
B) Increased risk of drug toxicity
C) Faster drug excretion
D) Reduced absorption rate
Correct Answer: Increased risk of drug toxicity
Rationale: Albumin is the most abundant plasma protein and serves as a primary binding site for
many drugs. When albumin levels are low, fewer binding sites are available, resulting in a higher
concentration of free, pharmacologically active drug in the bloodstream. This increased free drug
fraction can potentiate therapeutic effects and elevate the risk of toxicity.
7. The time required for the serum concentration of a drug to decrease by 50% is known as:
A) Peak level
B) Half-life
,C) Onset of action
D) Duration of action
Correct Answer: Half-life
Rationale: Half-life (t½) is a pharmacokinetic parameter representing the time required for the
plasma concentration of a drug to decline by one-half. It is used to estimate dosing intervals and the
time needed to reach steady-state concentrations. Peak level, onset, and duration describe other
aspects of a drug’s concentration-time profile.
8. Which organ is primarily responsible for drug excretion?
A) Liver
B) Pancreas
C) Kidneys
D) Lungs
Correct Answer: Kidneys
Rationale: The kidneys are the primary organs for eliminating drugs and their metabolites from the
body through urine. Renal filtration, secretion, and reabsorption collectively determine the rate of
drug clearance. While the liver metabolizes drugs and the lungs can excrete volatile substances, the
kidneys handle the majority of drug elimination.
9. Which phase of pharmacokinetics is most affected by a patient’s liver disease?
A) Absorption
B) Distribution
C) Metabolism
D) Excretion
Correct Answer: Metabolism
Rationale: The liver is the primary site of drug metabolism, primarily through the cytochrome P450
enzyme system. Liver disease impairs hepatic enzyme activity and blood flow, reducing the body’s
ability to break down drugs and potentially leading to drug accumulation and toxicity. Absorption,
distribution, and excretion are less directly affected by hepatic dysfunction.
10. The nurse is administering a drug that is highly protein-bound. What occurs when a second
highly protein-bound drug is added?
A) The first drug becomes inactive
B) The second drug is excreted faster
C) There is a risk of toxicity for both drugs
D) Protein binding increases for both drugs
Correct Answer: There is a risk of toxicity for both drugs
, Rationale: When two highly protein-bound drugs compete for the same limited binding sites on
plasma proteins, the amount of free, unbound drug increases for both agents. This elevated free drug
concentration can enhance pharmacological effects and increase the risk of toxicity. Protein binding
does not increase; rather, displacement occurs.
11. Which term describes the percentage of an administered drug dose that reaches the
systemic circulation?
A) Bioavailability
B) Therapeutic index
C) Distribution volume
D) Clearance rate
Correct Answer: Bioavailability
Rationale: Bioavailability is the fraction of an administered dose of unchanged drug that reaches the
systemic circulation. It is a key pharmacokinetic parameter that determines the onset and intensity of
drug effects. The therapeutic index describes safety margins, distribution volume relates to tissue
distribution, and clearance measures elimination efficiency.
12. A drug has a half-life of 4 hours. If 1000 mg is administered at 12:00 PM, how much drug
remains at 8:00 PM?
A) 500 mg
B) 125 mg
C) 250 mg
D) 750 mg
Correct Answer: 250 mg
Rationale: From 12:00 PM to 8:00 PM, 8 hours have elapsed, representing two half-lives (8 ÷ 4 = 2).
After the first half-life, 500 mg remains. After the second half-life, 250 mg remains. This calculation
illustrates the exponential decline of drug concentration with each half-life interval.
13. Which phase of pharmacokinetics is most affected by a patient’s renal function?
A) Absorption
B) Distribution
C) Metabolism
D) Excretion
Correct Answer: Excretion
Rationale: Renal function directly determines the rate at which drugs and their metabolites are
eliminated from the body. Impaired kidney function reduces glomerular filtration and tubular
secretion, leading to drug accumulation and potential toxicity. While the kidneys contribute minimally
to absorption and metabolism, they are the primary organs for drug excretion.
14. An agonist is a drug that:
2026/2027 | Pharmacology Q&A | Nursing
1. What is the term used to describe the study of what the body does to a drug?
A) Pharmacodynamics
B) Pharmacognosy
C) Pharmacotherapeutics
D) Pharmacokinetics
Correct Answer: Pharmacokinetics
Rationale: Pharmacokinetics encompasses the processes of absorption, distribution, metabolism, and
excretion, describing how the body affects a drug over time. Pharmacodynamics, by contrast,
describes what the drug does to the body. The other options refer to different aspects of
pharmacology unrelated to drug movement and transformation.
2. Which process involves the movement of a drug from its site of administration into the
bloodstream?
A) Distribution
B) Metabolism
C) Absorption
D) Excretion
Correct Answer: Absorption
Rationale: Absorption is defined as the movement of a drug from its site of administration into the
systemic circulation. Distribution follows absorption and involves the movement of drug from blood
to tissues. Metabolism and excretion occur after the drug has entered the bloodstream and are not
the initial transfer process.
3. The first-pass effect refers to the metabolism of a drug in which organ before it reaches
systemic circulation?
A) Lungs
B) Liver
C) Kidneys
D) Small Intestine
Correct Answer: Liver
Rationale: Orally administered drugs are absorbed through the gastrointestinal tract and transported
via the portal vein directly to the liver, where extensive metabolism may occur before the drug
reaches the systemic circulation. This hepatic first-pass metabolism can significantly reduce the
bioavailability of oral medications. The lungs, kidneys, and small intestine do not serve as the primary
site for this presystemic elimination.
, 4. Which route of administration provides 100% bioavailability?
A) Oral
B) Subcutaneous
C) Intramuscular
D) Intravenous
Correct Answer: Intravenous
Rationale: Intravenous administration delivers the drug directly into the bloodstream, bypassing
absorption barriers and the first-pass effect, thereby making the entire dose available to the systemic
circulation. Oral drugs undergo absorption and first-pass metabolism, reducing bioavailability.
Subcutaneous and intramuscular routes require absorption from tissue sites before reaching
circulation.
5. What occurs when a drug binds to a receptor and produces a maximal biological response?
A) Antagonist activity
B) Partial agonist activity
C) Agonist activity
D) Enzyme induction
Correct Answer: Agonist activity
Rationale: An agonist is a drug that binds to a receptor and activates it to produce a physiological
response, mimicking the action of endogenous regulatory molecules. Antagonists bind to receptors
but do not activate them, blocking the effects of agonists. Partial agonists produce a submaximal
response, and enzyme induction is unrelated to receptor binding.
6. A patient has low serum albumin levels. How might this affect a highly protein-bound drug?
A) Decreased drug effectiveness
B) Increased risk of drug toxicity
C) Faster drug excretion
D) Reduced absorption rate
Correct Answer: Increased risk of drug toxicity
Rationale: Albumin is the most abundant plasma protein and serves as a primary binding site for
many drugs. When albumin levels are low, fewer binding sites are available, resulting in a higher
concentration of free, pharmacologically active drug in the bloodstream. This increased free drug
fraction can potentiate therapeutic effects and elevate the risk of toxicity.
7. The time required for the serum concentration of a drug to decrease by 50% is known as:
A) Peak level
B) Half-life
,C) Onset of action
D) Duration of action
Correct Answer: Half-life
Rationale: Half-life (t½) is a pharmacokinetic parameter representing the time required for the
plasma concentration of a drug to decline by one-half. It is used to estimate dosing intervals and the
time needed to reach steady-state concentrations. Peak level, onset, and duration describe other
aspects of a drug’s concentration-time profile.
8. Which organ is primarily responsible for drug excretion?
A) Liver
B) Pancreas
C) Kidneys
D) Lungs
Correct Answer: Kidneys
Rationale: The kidneys are the primary organs for eliminating drugs and their metabolites from the
body through urine. Renal filtration, secretion, and reabsorption collectively determine the rate of
drug clearance. While the liver metabolizes drugs and the lungs can excrete volatile substances, the
kidneys handle the majority of drug elimination.
9. Which phase of pharmacokinetics is most affected by a patient’s liver disease?
A) Absorption
B) Distribution
C) Metabolism
D) Excretion
Correct Answer: Metabolism
Rationale: The liver is the primary site of drug metabolism, primarily through the cytochrome P450
enzyme system. Liver disease impairs hepatic enzyme activity and blood flow, reducing the body’s
ability to break down drugs and potentially leading to drug accumulation and toxicity. Absorption,
distribution, and excretion are less directly affected by hepatic dysfunction.
10. The nurse is administering a drug that is highly protein-bound. What occurs when a second
highly protein-bound drug is added?
A) The first drug becomes inactive
B) The second drug is excreted faster
C) There is a risk of toxicity for both drugs
D) Protein binding increases for both drugs
Correct Answer: There is a risk of toxicity for both drugs
, Rationale: When two highly protein-bound drugs compete for the same limited binding sites on
plasma proteins, the amount of free, unbound drug increases for both agents. This elevated free drug
concentration can enhance pharmacological effects and increase the risk of toxicity. Protein binding
does not increase; rather, displacement occurs.
11. Which term describes the percentage of an administered drug dose that reaches the
systemic circulation?
A) Bioavailability
B) Therapeutic index
C) Distribution volume
D) Clearance rate
Correct Answer: Bioavailability
Rationale: Bioavailability is the fraction of an administered dose of unchanged drug that reaches the
systemic circulation. It is a key pharmacokinetic parameter that determines the onset and intensity of
drug effects. The therapeutic index describes safety margins, distribution volume relates to tissue
distribution, and clearance measures elimination efficiency.
12. A drug has a half-life of 4 hours. If 1000 mg is administered at 12:00 PM, how much drug
remains at 8:00 PM?
A) 500 mg
B) 125 mg
C) 250 mg
D) 750 mg
Correct Answer: 250 mg
Rationale: From 12:00 PM to 8:00 PM, 8 hours have elapsed, representing two half-lives (8 ÷ 4 = 2).
After the first half-life, 500 mg remains. After the second half-life, 250 mg remains. This calculation
illustrates the exponential decline of drug concentration with each half-life interval.
13. Which phase of pharmacokinetics is most affected by a patient’s renal function?
A) Absorption
B) Distribution
C) Metabolism
D) Excretion
Correct Answer: Excretion
Rationale: Renal function directly determines the rate at which drugs and their metabolites are
eliminated from the body. Impaired kidney function reduces glomerular filtration and tubular
secretion, leading to drug accumulation and potential toxicity. While the kidneys contribute minimally
to absorption and metabolism, they are the primary organs for drug excretion.
14. An agonist is a drug that:
