,WGU D115 OA Advanced Pathophysiology Exam Prep 2026/2027 | 500+ Practice
Questions & Answers with Rationales | Study Guide PDF
1. A 30-day-old infant presents to the emergency room with decreased oral intake,
decreased urine output, and a fever of 101.8°F. The infant is admitted for further
evaluation with a workup to include a blood culture, a urine culture, a spinal tap, and a
chest X-ray.
Which issue of innate immunity, as it relates to neonates, is of concern?
A. Deficiency of secretory IgA
B. Relative deficiency of factor B
C. Hyperactive complement activation
D. Increased neutrophil chemotaxis
Answer: B. Relative deficiency of factor B
Expert Rationale:
Neonates have an immature innate immune system, including reduced activity of the alternative
complement pathway due to a relative deficiency of factor B. This decreases opsonization and
bacterial killing, making young infants highly susceptible to severe bacterial infections such as
sepsis and meningitis. While secretory IgA is also limited, it is part of mucosal adaptive
immunity rather than the specific innate complement defect being tested.
2. A 12-year-old African American patient presents with unilateral eye swelling and lower
lip swelling. The patient's parent reports that the swelling is spontaneous and resolves over
several days. The patient does not have complaints of fever, hives, or vomiting. Serum lab
results show hyperactivation of three plasma protein systems. The APRN suspects
hereditary angioedema.
What is the cause of the genetic defect suspected in this situation?
A. C3 deficiency
B. C1 esterase inhibitor deficiency
C. Factor VIII mutation
D. IgE receptor mutation
Answer: B. C1 esterase inhibitor deficiency
Expert Rationale:
Hereditary angioedema is an autosomal dominant disorder caused by deficiency or dysfunction
of the C1 esterase inhibitor (C1-INH). Loss of C1-INH results in uncontrolled activation of the
complement, coagulation, and kallikrein-kinin systems, producing excessive bradykinin and
,recurrent episodes of nonpruritic angioedema without urticaria. Bradykinin-mediated
angioedema does not respond well to antihistamines or corticosteroids.
3. The parent of a child diagnosed with Down syndrome expresses concerns about the
child's recurrent respiratory tract infections to an advanced practice registered nurse
(APRN). The infections have occurred regularly since birth.
What should the APRN tell the parent is the underlying cause of this illness?
A. Chronic neutrophil dysfunction
B. Gastroesophageal reflux disease causes aspiration of thin fluids
C. Excessive production of immunoglobulin E
D. Deficiency of surfactant production
Answer: B. Gastroesophageal reflux disease causes aspiration of thin fluids
Expert Rationale:
Children with Down syndrome commonly experience recurrent respiratory infections because of
multiple contributing factors, including hypotonia, airway abnormalities, congenital heart
disease, and gastroesophageal reflux, which increases the risk of aspiration and recurrent
pulmonary infections. Immune dysfunction may contribute, but aspiration secondary to reflux is
a major mechanism emphasized in clinical practice.
4. A 36-year-old patient is being seen by an advanced practice registered nurse (APRN) in a
primary care clinic for the first time. The patient reports feeling depressed due to a major
life change. Additional symptoms include weight gain, sedentary activity, and insomnia.
The APRN plans on providing the patient with several exercises to reduce the physiological
effect of stress.
Why is the APRN concerned about relieving this emotional response?
A. It decreases glucose uptake.
B. It increases insulin sensitivity.
C. It suppresses cortisol production immediately.
D. It decreases catecholamine release permanently.
Answer: A. It decreases glucose uptake.
Expert Rationale:
Chronic stress activates the hypothalamic-pituitary-adrenal (HPA) axis, increasing cortisol
secretion. Elevated cortisol promotes insulin resistance and decreases glucose uptake by
peripheral tissues, contributing to hyperglycemia, obesity, metabolic syndrome, and chronic
, inflammation. Exercise helps reduce stress hormone levels, improve insulin sensitivity, and
restore metabolic balance.
5. An 80-year-old patient brings her grandchildren with her to a routine medical
appointment. The patient has moderate chronic obstructive pulmonary disease (COPD)
and is concerned about developing pneumonia because of its increased incidence at the
senior center.
What should the nurse practitioner recommend for this patient?
A. Daily prophylactic antibiotics
B. Annual chest radiographs
C. Getting an annual influenza vaccine
D. Monthly pulmonary function testing
Answer: C. Getting an annual influenza vaccine
Expert Rationale:
Older adults with COPD are at increased risk for influenza and secondary bacterial pneumonia
because of immunosenescence and impaired mucociliary clearance. Annual influenza
vaccination is one of the most effective preventive interventions and reduces hospitalization,
severe respiratory illness, and mortality. Pneumococcal vaccination should also be recommended
according to current adult immunization guidelines.
6. An advanced practice nurse (APRN) is working with a patient who is choosing to
undergo breast removal due to family history of breast cancer. The patient's genetic testing
revealed an abnormal BRCA1. The patient shares with the APRN that she is relieved that
she will not need to worry about cancer once the breast tissue is removed. The APRN
proceeds to educate the patient about additional risks.
Which other type of cancer is the patient at risk for developing?
A. Colon cancer
B. Thyroid cancer
C. Ovarian cancer
D. Pancreatic cancer
Answer: C. Ovarian cancer
Expert Rationale:
BRCA1 is a tumor suppressor gene involved in DNA repair through homologous recombination.
Pathogenic BRCA1 mutations significantly increase lifetime risks of both breast and ovarian
Questions & Answers with Rationales | Study Guide PDF
1. A 30-day-old infant presents to the emergency room with decreased oral intake,
decreased urine output, and a fever of 101.8°F. The infant is admitted for further
evaluation with a workup to include a blood culture, a urine culture, a spinal tap, and a
chest X-ray.
Which issue of innate immunity, as it relates to neonates, is of concern?
A. Deficiency of secretory IgA
B. Relative deficiency of factor B
C. Hyperactive complement activation
D. Increased neutrophil chemotaxis
Answer: B. Relative deficiency of factor B
Expert Rationale:
Neonates have an immature innate immune system, including reduced activity of the alternative
complement pathway due to a relative deficiency of factor B. This decreases opsonization and
bacterial killing, making young infants highly susceptible to severe bacterial infections such as
sepsis and meningitis. While secretory IgA is also limited, it is part of mucosal adaptive
immunity rather than the specific innate complement defect being tested.
2. A 12-year-old African American patient presents with unilateral eye swelling and lower
lip swelling. The patient's parent reports that the swelling is spontaneous and resolves over
several days. The patient does not have complaints of fever, hives, or vomiting. Serum lab
results show hyperactivation of three plasma protein systems. The APRN suspects
hereditary angioedema.
What is the cause of the genetic defect suspected in this situation?
A. C3 deficiency
B. C1 esterase inhibitor deficiency
C. Factor VIII mutation
D. IgE receptor mutation
Answer: B. C1 esterase inhibitor deficiency
Expert Rationale:
Hereditary angioedema is an autosomal dominant disorder caused by deficiency or dysfunction
of the C1 esterase inhibitor (C1-INH). Loss of C1-INH results in uncontrolled activation of the
complement, coagulation, and kallikrein-kinin systems, producing excessive bradykinin and
,recurrent episodes of nonpruritic angioedema without urticaria. Bradykinin-mediated
angioedema does not respond well to antihistamines or corticosteroids.
3. The parent of a child diagnosed with Down syndrome expresses concerns about the
child's recurrent respiratory tract infections to an advanced practice registered nurse
(APRN). The infections have occurred regularly since birth.
What should the APRN tell the parent is the underlying cause of this illness?
A. Chronic neutrophil dysfunction
B. Gastroesophageal reflux disease causes aspiration of thin fluids
C. Excessive production of immunoglobulin E
D. Deficiency of surfactant production
Answer: B. Gastroesophageal reflux disease causes aspiration of thin fluids
Expert Rationale:
Children with Down syndrome commonly experience recurrent respiratory infections because of
multiple contributing factors, including hypotonia, airway abnormalities, congenital heart
disease, and gastroesophageal reflux, which increases the risk of aspiration and recurrent
pulmonary infections. Immune dysfunction may contribute, but aspiration secondary to reflux is
a major mechanism emphasized in clinical practice.
4. A 36-year-old patient is being seen by an advanced practice registered nurse (APRN) in a
primary care clinic for the first time. The patient reports feeling depressed due to a major
life change. Additional symptoms include weight gain, sedentary activity, and insomnia.
The APRN plans on providing the patient with several exercises to reduce the physiological
effect of stress.
Why is the APRN concerned about relieving this emotional response?
A. It decreases glucose uptake.
B. It increases insulin sensitivity.
C. It suppresses cortisol production immediately.
D. It decreases catecholamine release permanently.
Answer: A. It decreases glucose uptake.
Expert Rationale:
Chronic stress activates the hypothalamic-pituitary-adrenal (HPA) axis, increasing cortisol
secretion. Elevated cortisol promotes insulin resistance and decreases glucose uptake by
peripheral tissues, contributing to hyperglycemia, obesity, metabolic syndrome, and chronic
, inflammation. Exercise helps reduce stress hormone levels, improve insulin sensitivity, and
restore metabolic balance.
5. An 80-year-old patient brings her grandchildren with her to a routine medical
appointment. The patient has moderate chronic obstructive pulmonary disease (COPD)
and is concerned about developing pneumonia because of its increased incidence at the
senior center.
What should the nurse practitioner recommend for this patient?
A. Daily prophylactic antibiotics
B. Annual chest radiographs
C. Getting an annual influenza vaccine
D. Monthly pulmonary function testing
Answer: C. Getting an annual influenza vaccine
Expert Rationale:
Older adults with COPD are at increased risk for influenza and secondary bacterial pneumonia
because of immunosenescence and impaired mucociliary clearance. Annual influenza
vaccination is one of the most effective preventive interventions and reduces hospitalization,
severe respiratory illness, and mortality. Pneumococcal vaccination should also be recommended
according to current adult immunization guidelines.
6. An advanced practice nurse (APRN) is working with a patient who is choosing to
undergo breast removal due to family history of breast cancer. The patient's genetic testing
revealed an abnormal BRCA1. The patient shares with the APRN that she is relieved that
she will not need to worry about cancer once the breast tissue is removed. The APRN
proceeds to educate the patient about additional risks.
Which other type of cancer is the patient at risk for developing?
A. Colon cancer
B. Thyroid cancer
C. Ovarian cancer
D. Pancreatic cancer
Answer: C. Ovarian cancer
Expert Rationale:
BRCA1 is a tumor suppressor gene involved in DNA repair through homologous recombination.
Pathogenic BRCA1 mutations significantly increase lifetime risks of both breast and ovarian
