NUR 6011/NUR6011 Exam 1 V2 | Advance
Pharmacology Q&A with Rationale |
William Paterson University
1. Which phase of pharmacokinetics involves the movement of a drug from its site of
administration into the bloodstream?
A. Absorption
B. Metabolism
C. Distribution
D. Excretion
Answer: A
Rationale: Absorption is the primary process by which a drug enters the systemic
circulation from the site of administration. This process is influenced by the drug’s lipid
solubility, ionization state, and the surface area of the absorption site. Understanding
absorption is critical for determining the onset of action and the bioavailability of various
medications.
2. When an oral medication is largely inactivated by the liver before reaching the systemic
circulation, this is known as:
A. The blood-brain barrier
B. The first-pass effect
,C. Passive diffusion
D. Enterohepatic recirculation
Answer: B
Rationale: The first-pass effect occurs when drugs absorbed from the gastrointestinal tract
are carried directly to the liver via the hepatic portal vein. In the liver, significant
metabolism can occur, reducing the amount of active drug that reaches the rest of the body.
This phenomenon is why some drugs require much higher oral doses compared to
intravenous doses.
3. A drug with a high volume of distribution (Vd) is most likely to be found in which area of
the body?
A. Extravascular tissues and fat
B. Intravascular compartment only
C. Confined to the plasma
D. Bound strictly to albumin
Answer: A
Rationale: A high volume of distribution indicates that a drug is widely distributed into
tissues outside of the plasma compartment. This often occurs with highly lipid-soluble
drugs or those that bind strongly to tissue components. Conversely, drugs with a low Vd
tend to remain within the blood vessels or extracellular fluid.
, 4. How many half-lives are generally required for a drug to reach steady-state concentrations
in the body?
A. One to two
B. Four to five
C. Seven to eight
D. Ten to twelve
Answer: B
Rationale: Steady state is reached when the rate of drug administration equals the rate of
drug elimination. It typically takes approximately four to five half-lives for a drug to reach
this plateau during constant dosing. This concept is essential for clinicians to understand
when monitoring therapeutic drug levels and assessing treatment efficacy.
5. Which of the following describes an ‘agonist’ in pharmacodynamics?
A. A drug that blocks a receptor’s action
B. A drug that has no effect on receptors
C. A drug that activates a receptor to produce a biological response
D. A drug that permanently damages a receptor
Answer: C
Rationale: An agonist is a molecule that binds to a receptor and mimics the action of the
endogenous ligand, triggering a physiological response. Agonists possess both affinity for
Pharmacology Q&A with Rationale |
William Paterson University
1. Which phase of pharmacokinetics involves the movement of a drug from its site of
administration into the bloodstream?
A. Absorption
B. Metabolism
C. Distribution
D. Excretion
Answer: A
Rationale: Absorption is the primary process by which a drug enters the systemic
circulation from the site of administration. This process is influenced by the drug’s lipid
solubility, ionization state, and the surface area of the absorption site. Understanding
absorption is critical for determining the onset of action and the bioavailability of various
medications.
2. When an oral medication is largely inactivated by the liver before reaching the systemic
circulation, this is known as:
A. The blood-brain barrier
B. The first-pass effect
,C. Passive diffusion
D. Enterohepatic recirculation
Answer: B
Rationale: The first-pass effect occurs when drugs absorbed from the gastrointestinal tract
are carried directly to the liver via the hepatic portal vein. In the liver, significant
metabolism can occur, reducing the amount of active drug that reaches the rest of the body.
This phenomenon is why some drugs require much higher oral doses compared to
intravenous doses.
3. A drug with a high volume of distribution (Vd) is most likely to be found in which area of
the body?
A. Extravascular tissues and fat
B. Intravascular compartment only
C. Confined to the plasma
D. Bound strictly to albumin
Answer: A
Rationale: A high volume of distribution indicates that a drug is widely distributed into
tissues outside of the plasma compartment. This often occurs with highly lipid-soluble
drugs or those that bind strongly to tissue components. Conversely, drugs with a low Vd
tend to remain within the blood vessels or extracellular fluid.
, 4. How many half-lives are generally required for a drug to reach steady-state concentrations
in the body?
A. One to two
B. Four to five
C. Seven to eight
D. Ten to twelve
Answer: B
Rationale: Steady state is reached when the rate of drug administration equals the rate of
drug elimination. It typically takes approximately four to five half-lives for a drug to reach
this plateau during constant dosing. This concept is essential for clinicians to understand
when monitoring therapeutic drug levels and assessing treatment efficacy.
5. Which of the following describes an ‘agonist’ in pharmacodynamics?
A. A drug that blocks a receptor’s action
B. A drug that has no effect on receptors
C. A drug that activates a receptor to produce a biological response
D. A drug that permanently damages a receptor
Answer: C
Rationale: An agonist is a molecule that binds to a receptor and mimics the action of the
endogenous ligand, triggering a physiological response. Agonists possess both affinity for
