TCDHA PHARMACOLOGY MIDTERM
EXAMINATION 2026 Complete
Comprehensive Review Guide with
Questions, Answers, and Clinical
Rationales
SECTION 1: PHARMACOKINETICS & DRUG ABSORPTION (Q1-20)
1. The term ________ describes the movement of molecules across a
membrane down a pressure gradient from an area of higher pressure
to an area of lower pressure, normally resulting from hydrostatic
forces.
A) Active transport
B) Carrier-mediated diffusion
C) Filtration
D) Osmosis
Answer: C) Filtration
Rationale: Filtration is the movement of molecules across a membrane
down a pressure gradient, driven by hydrostatic forces. Active transport
requires ATP energy, carrier-mediated diffusion uses protein carriers, and
osmosis specifically involves water movement across a semipermeable
membrane.
,2. Glucose in the bloodstream is a large molecule that cannot readily
enter a cell unless it binds with insulin. This BEST describes:
A) Osmosis
B) Diffusion
C) Carrier-mediated diffusion
D) Absorption
Answer: C) Carrier-mediated diffusion
Rationale: Carrier-mediated diffusion requires a helper protein (like insulin
with glucose) to cause a change in the cellular membrane, allowing entry of
the substance. Osmosis involves only water, diffusion is a broader term, and
absorption refers to the medication's progress from dosage form to
bioavailability.
3. Which of the following forms of absorption is generally the slowest
due to decreased vascular supply?
A) Subcutaneous
B) Intramuscular
C) Intravenous
D) Sublingual
Answer: A) Subcutaneous
Rationale: The subcutaneous layer is composed of dense fatty tissue with
poor vascular supply, resulting in slow medication absorption. Muscles have
,good blood supply, intravenous provides the most rapid route, and the
sublingual area is highly vascular.
4. The process in which a medication is transported from the site of
absorption to the site of action is BEST described as:
A) Active transport
B) Diffusion
C) Distribution
D) Elimination
Answer: C) Distribution
Rationale: Distribution is the process whereby a medication is transported
from the site of absorption to the site of action. Active transport involves
movement across cellular membranes using energy, diffusion describes
movement across membranes, and elimination is removal from the body.
5. A patient with renal disease and decreased perfusion of the kidneys
receives a diuretic medication like Lasix that normally acts on the
kidneys. What effect will this have?
A) The drug will be present in increased concentrations resulting in
toxicity
B) The drug will be poorly delivered and will not produce desired
results
, C) Effects will be unchanged as kidneys are the primary organ of
elimination
D) The drug will be metabolized by the liver instead
Answer: B) The drug will be poorly delivered and will not produce
desired results
Rationale: Decreased renal blood flow results in poor delivery of the
medication to the kidney, preventing the drug from producing the desired
results. The drug must reach its target organ in sufficient concentration to
be effective.
6. A drug that is considered highly protein bound upon entering the
body will:
A) Be largely ineffective when administered intravenously
B) Have a relatively short half-life due to rapid elimination
C) Remain active in the bloodstream with only small percentage
bound
D) Remain bound to proteins but slowly release active component,
resulting in a long half-life
Answer: D) Remain bound to proteins but slowly release active
component, resulting in a long half-life
Rationale: When a drug is highly protein bound, much of it is stored in
protein reservoirs. Only a small amount remains in the bloodstream as an
active metabolite. The bound component slowly releases as the free active
component is metabolized, resulting in a long half-life.
EXAMINATION 2026 Complete
Comprehensive Review Guide with
Questions, Answers, and Clinical
Rationales
SECTION 1: PHARMACOKINETICS & DRUG ABSORPTION (Q1-20)
1. The term ________ describes the movement of molecules across a
membrane down a pressure gradient from an area of higher pressure
to an area of lower pressure, normally resulting from hydrostatic
forces.
A) Active transport
B) Carrier-mediated diffusion
C) Filtration
D) Osmosis
Answer: C) Filtration
Rationale: Filtration is the movement of molecules across a membrane
down a pressure gradient, driven by hydrostatic forces. Active transport
requires ATP energy, carrier-mediated diffusion uses protein carriers, and
osmosis specifically involves water movement across a semipermeable
membrane.
,2. Glucose in the bloodstream is a large molecule that cannot readily
enter a cell unless it binds with insulin. This BEST describes:
A) Osmosis
B) Diffusion
C) Carrier-mediated diffusion
D) Absorption
Answer: C) Carrier-mediated diffusion
Rationale: Carrier-mediated diffusion requires a helper protein (like insulin
with glucose) to cause a change in the cellular membrane, allowing entry of
the substance. Osmosis involves only water, diffusion is a broader term, and
absorption refers to the medication's progress from dosage form to
bioavailability.
3. Which of the following forms of absorption is generally the slowest
due to decreased vascular supply?
A) Subcutaneous
B) Intramuscular
C) Intravenous
D) Sublingual
Answer: A) Subcutaneous
Rationale: The subcutaneous layer is composed of dense fatty tissue with
poor vascular supply, resulting in slow medication absorption. Muscles have
,good blood supply, intravenous provides the most rapid route, and the
sublingual area is highly vascular.
4. The process in which a medication is transported from the site of
absorption to the site of action is BEST described as:
A) Active transport
B) Diffusion
C) Distribution
D) Elimination
Answer: C) Distribution
Rationale: Distribution is the process whereby a medication is transported
from the site of absorption to the site of action. Active transport involves
movement across cellular membranes using energy, diffusion describes
movement across membranes, and elimination is removal from the body.
5. A patient with renal disease and decreased perfusion of the kidneys
receives a diuretic medication like Lasix that normally acts on the
kidneys. What effect will this have?
A) The drug will be present in increased concentrations resulting in
toxicity
B) The drug will be poorly delivered and will not produce desired
results
, C) Effects will be unchanged as kidneys are the primary organ of
elimination
D) The drug will be metabolized by the liver instead
Answer: B) The drug will be poorly delivered and will not produce
desired results
Rationale: Decreased renal blood flow results in poor delivery of the
medication to the kidney, preventing the drug from producing the desired
results. The drug must reach its target organ in sufficient concentration to
be effective.
6. A drug that is considered highly protein bound upon entering the
body will:
A) Be largely ineffective when administered intravenously
B) Have a relatively short half-life due to rapid elimination
C) Remain active in the bloodstream with only small percentage
bound
D) Remain bound to proteins but slowly release active component,
resulting in a long half-life
Answer: D) Remain bound to proteins but slowly release active
component, resulting in a long half-life
Rationale: When a drug is highly protein bound, much of it is stored in
protein reservoirs. Only a small amount remains in the bloodstream as an
active metabolite. The bound component slowly releases as the free active
component is metabolized, resulting in a long half-life.
