WGU D116 Unit 3 EXAM LATEST VERSION COMPLETE 100
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED
A+.
A patient asks their healthcare provider to explain the concept
of drug tolerance that was mentioned during their consultation.
Which of the following statements accurately defines
pharmacological tolerance?
a. A severe allergic reaction that occurs after the first dose of a
medication
b. A psychological dependence where the patient feels they
cannot function without the drug
c. A state in which a patient may need increased amounts of the
drug over time to achieve the same therapeutic effect
d. A condition where the drug's side effects become
permanently irreversible
✔️ Correct Answer: C
Rationale:
Drug tolerance is a pharmacological phenomenon characterized
by a diminished response to a medication after repeated or
prolonged use. Consequently, the patient requires a higher
dosage to attain the same clinical effect that was previously
achieved with a lower dose. This is a common physiological
adaptation and is distinct from addiction or allergy. Option A
,describes a hypersensitivity reaction. Option B describes
psychological dependence. Option D is inaccurate.
A group of nursing students is studying the physiology of the
central nervous system and asks the clinical nurse to explain the
function of the blood-brain barrier (BBB). Which statement by
the nurse correctly describes the primary function of the BBB?
a. It facilitates the rapid absorption of all oral medications into
the systemic circulation
b. It prevents some potentially toxic or harmful substances from
crossing from the bloodstream into the central nervous system
c. It allows all lipid-insoluble drugs to easily penetrate and reach
brain tissues
d. It is a physical barrier that completely blocks the passage of
all medications into the brain
✔️ Correct Answer: B
Rationale:
The blood-brain barrier is a highly selective semipermeable
border of endothelial cells that prevents solutes in the
circulating blood from non-selectively crossing into the
extracellular fluid of the central nervous system. It serves a
protective function by blocking many potentially toxic
substances, pathogens, and highly ionized or protein-bound
drugs from entering the brain. However, it does allow lipid-
soluble drugs and those using specific transport systems to
,cross. Option A is incorrect; absorption happens in the GI tract.
Option C is the opposite of the truth (lipid-soluble drugs do
cross). Option D is incorrect as it is selective, not absolute.
A pregnant patient at 34 weeks gestation is admitted to the
obstetrical unit in premature labor. The provider orders a
medication to help relax the uterine muscles and slow down the
contractions. Which class of drugs is most appropriate for
achieving this therapeutic effect?
a. Beta-1 antagonist
b. Beta-2 agonist
c. Alpha-1 antagonist
d. Muscarinic agonist
✔️ Correct Answer: B
Rationale:
Beta-2 adrenergic agonists are used as tocolytic agents to relax
uterine smooth muscle, thereby suppressing premature uterine
contractions. Activation of beta-2 receptors in the myometrium
leads to muscle relaxation. Option A (Beta-1 antagonist) affects
the heart. Option C (Alpha-1 antagonist) affects vasodilation.
Option D (Muscarinic agonist) would stimulate the
parasympathetic system.
, A patient is receiving a drug that selectively stimulates alpha-1
adrenergic receptors. The nurse should primarily monitor this
patient for which of the following therapeutic or adverse
effects?
a. Bronchodilation and decreased respiratory rate
b. Increased heart rate and increased force of cardiac
contraction
c. Vasoconstriction of arterioles leading to increased blood
pressure
d. Relaxation of the detrusor muscle in the bladder
✔️ Correct Answer: C
Rationale:
Alpha-1 adrenergic receptors are primarily located on vascular
smooth muscle (arterioles and veins). When activated by an
agonist, they cause vasoconstriction, which increases systemic
vascular resistance and subsequently elevates blood pressure.
Option A describes Beta-2 effects. Option B describes Beta-1
effects. Option D is related to muscarinic receptor activation in
the bladder.
A nursing instructor is explaining the clinical indications for
anticholinergic drugs to a group of students. The instructor
correctly identifies that these medications are frequently used
to treat conditions involving which organ systems?
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED
A+.
A patient asks their healthcare provider to explain the concept
of drug tolerance that was mentioned during their consultation.
Which of the following statements accurately defines
pharmacological tolerance?
a. A severe allergic reaction that occurs after the first dose of a
medication
b. A psychological dependence where the patient feels they
cannot function without the drug
c. A state in which a patient may need increased amounts of the
drug over time to achieve the same therapeutic effect
d. A condition where the drug's side effects become
permanently irreversible
✔️ Correct Answer: C
Rationale:
Drug tolerance is a pharmacological phenomenon characterized
by a diminished response to a medication after repeated or
prolonged use. Consequently, the patient requires a higher
dosage to attain the same clinical effect that was previously
achieved with a lower dose. This is a common physiological
adaptation and is distinct from addiction or allergy. Option A
,describes a hypersensitivity reaction. Option B describes
psychological dependence. Option D is inaccurate.
A group of nursing students is studying the physiology of the
central nervous system and asks the clinical nurse to explain the
function of the blood-brain barrier (BBB). Which statement by
the nurse correctly describes the primary function of the BBB?
a. It facilitates the rapid absorption of all oral medications into
the systemic circulation
b. It prevents some potentially toxic or harmful substances from
crossing from the bloodstream into the central nervous system
c. It allows all lipid-insoluble drugs to easily penetrate and reach
brain tissues
d. It is a physical barrier that completely blocks the passage of
all medications into the brain
✔️ Correct Answer: B
Rationale:
The blood-brain barrier is a highly selective semipermeable
border of endothelial cells that prevents solutes in the
circulating blood from non-selectively crossing into the
extracellular fluid of the central nervous system. It serves a
protective function by blocking many potentially toxic
substances, pathogens, and highly ionized or protein-bound
drugs from entering the brain. However, it does allow lipid-
soluble drugs and those using specific transport systems to
,cross. Option A is incorrect; absorption happens in the GI tract.
Option C is the opposite of the truth (lipid-soluble drugs do
cross). Option D is incorrect as it is selective, not absolute.
A pregnant patient at 34 weeks gestation is admitted to the
obstetrical unit in premature labor. The provider orders a
medication to help relax the uterine muscles and slow down the
contractions. Which class of drugs is most appropriate for
achieving this therapeutic effect?
a. Beta-1 antagonist
b. Beta-2 agonist
c. Alpha-1 antagonist
d. Muscarinic agonist
✔️ Correct Answer: B
Rationale:
Beta-2 adrenergic agonists are used as tocolytic agents to relax
uterine smooth muscle, thereby suppressing premature uterine
contractions. Activation of beta-2 receptors in the myometrium
leads to muscle relaxation. Option A (Beta-1 antagonist) affects
the heart. Option C (Alpha-1 antagonist) affects vasodilation.
Option D (Muscarinic agonist) would stimulate the
parasympathetic system.
, A patient is receiving a drug that selectively stimulates alpha-1
adrenergic receptors. The nurse should primarily monitor this
patient for which of the following therapeutic or adverse
effects?
a. Bronchodilation and decreased respiratory rate
b. Increased heart rate and increased force of cardiac
contraction
c. Vasoconstriction of arterioles leading to increased blood
pressure
d. Relaxation of the detrusor muscle in the bladder
✔️ Correct Answer: C
Rationale:
Alpha-1 adrenergic receptors are primarily located on vascular
smooth muscle (arterioles and veins). When activated by an
agonist, they cause vasoconstriction, which increases systemic
vascular resistance and subsequently elevates blood pressure.
Option A describes Beta-2 effects. Option B describes Beta-1
effects. Option D is related to muscarinic receptor activation in
the bladder.
A nursing instructor is explaining the clinical indications for
anticholinergic drugs to a group of students. The instructor
correctly identifies that these medications are frequently used
to treat conditions involving which organ systems?
