COMSAE Phase 1 – Form ASA 103 (Legacy
Integrative Organ Systems Layout) (2026
Edition): Comprehensive Multiple-Choice
Questions, Answers, and Detailed Rationales
Question 1
A 65-year-old man presents with crushing substernal chest
pain radiating to his left arm. Which laboratory marker rises
earliest after an acute myocardial infarction?
A. CK-MB
B. Troponin I
C. Myoglobin
D. LDH
Answer: C. Myoglobin
Myoglobin is the earliest marker to rise after myocardial
injury, often within 1–2 hours. However, it lacks specificity.
Troponins are more specific and remain elevated longer.
Question 2
A patient with chronic hypertension develops left ventricular
hypertrophy. What adaptation is occurring in the
myocardium?
,A. Hyperplasia
B. Dysplasia
C. Metaplasia
D. Hypertrophy
Answer: D. Hypertrophy
Cardiac muscle cells cannot significantly divide; therefore,
increased workload leads to enlargement of existing cells,
known as hypertrophy.
Question 3
A deficiency of intrinsic factor primarily causes impaired
absorption of:
A. Iron
B. Vitamin B12
C. Folate
D. Calcium
Answer: B. Vitamin B12
Intrinsic factor produced by gastric parietal cells is necessary
for vitamin B12 absorption in the terminal ileum. Deficiency
leads to pernicious anemia.
Question 4
A patient develops nephrotic syndrome. Which finding is
most characteristic?
,A. Hematuria
B. Hypertension only
C. Massive proteinuria
D. Red blood cell casts
Answer: C. Massive proteinuria
Nephrotic syndrome is characterized by proteinuria greater
than 3.5 g/day, hypoalbuminemia, edema, and
hyperlipidemia.
Question 5
Which cranial nerve is responsible for sensation from the
face?
A. Facial nerve (VII)
B. Vagus nerve (X)
C. Trigeminal nerve (V)
D. Hypoglossal nerve (XII)
Answer: C. Trigeminal nerve (V)
The trigeminal nerve provides the major sensory innervation
of the face through its ophthalmic, maxillary, and mandibular
divisions.
Question 6
A patient has hyperthyroidism due to Graves disease. Which
hypersensitivity reaction is involved?
, A. Type I
B. Type II
C. Type III
D. Type IV
Answer: B. Type II
Graves disease results from autoantibodies stimulating the
TSH receptor, a form of antibody-mediated (Type II)
hypersensitivity.
Question 7
The primary neurotransmitter released by parasympathetic
postganglionic neurons is:
A. Dopamine
B. Acetylcholine
C. Serotonin
D. Norepinephrine
Answer: B. Acetylcholine
Parasympathetic postganglionic neurons release
acetylcholine, which acts on muscarinic receptors in target
organs.
Question 8
A child presents with recurrent respiratory infections and
pancreatic insufficiency. The most likely diagnosis is:
Integrative Organ Systems Layout) (2026
Edition): Comprehensive Multiple-Choice
Questions, Answers, and Detailed Rationales
Question 1
A 65-year-old man presents with crushing substernal chest
pain radiating to his left arm. Which laboratory marker rises
earliest after an acute myocardial infarction?
A. CK-MB
B. Troponin I
C. Myoglobin
D. LDH
Answer: C. Myoglobin
Myoglobin is the earliest marker to rise after myocardial
injury, often within 1–2 hours. However, it lacks specificity.
Troponins are more specific and remain elevated longer.
Question 2
A patient with chronic hypertension develops left ventricular
hypertrophy. What adaptation is occurring in the
myocardium?
,A. Hyperplasia
B. Dysplasia
C. Metaplasia
D. Hypertrophy
Answer: D. Hypertrophy
Cardiac muscle cells cannot significantly divide; therefore,
increased workload leads to enlargement of existing cells,
known as hypertrophy.
Question 3
A deficiency of intrinsic factor primarily causes impaired
absorption of:
A. Iron
B. Vitamin B12
C. Folate
D. Calcium
Answer: B. Vitamin B12
Intrinsic factor produced by gastric parietal cells is necessary
for vitamin B12 absorption in the terminal ileum. Deficiency
leads to pernicious anemia.
Question 4
A patient develops nephrotic syndrome. Which finding is
most characteristic?
,A. Hematuria
B. Hypertension only
C. Massive proteinuria
D. Red blood cell casts
Answer: C. Massive proteinuria
Nephrotic syndrome is characterized by proteinuria greater
than 3.5 g/day, hypoalbuminemia, edema, and
hyperlipidemia.
Question 5
Which cranial nerve is responsible for sensation from the
face?
A. Facial nerve (VII)
B. Vagus nerve (X)
C. Trigeminal nerve (V)
D. Hypoglossal nerve (XII)
Answer: C. Trigeminal nerve (V)
The trigeminal nerve provides the major sensory innervation
of the face through its ophthalmic, maxillary, and mandibular
divisions.
Question 6
A patient has hyperthyroidism due to Graves disease. Which
hypersensitivity reaction is involved?
, A. Type I
B. Type II
C. Type III
D. Type IV
Answer: B. Type II
Graves disease results from autoantibodies stimulating the
TSH receptor, a form of antibody-mediated (Type II)
hypersensitivity.
Question 7
The primary neurotransmitter released by parasympathetic
postganglionic neurons is:
A. Dopamine
B. Acetylcholine
C. Serotonin
D. Norepinephrine
Answer: B. Acetylcholine
Parasympathetic postganglionic neurons release
acetylcholine, which acts on muscarinic receptors in target
organs.
Question 8
A child presents with recurrent respiratory infections and
pancreatic insufficiency. The most likely diagnosis is:
