COMSAE Phase 1 Form B Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1.
A 22-year-old student presents with fatigue, pallor, and pica. Lab results
show microcytic hypochromic anemia. Which is the most likely cause?
A. Vitamin B12 deficiency
B. Iron deficiency
C. Aplastic anemia
D. Folate deficiency
Answer: B. Iron deficiency
Rationale: Iron deficiency anemia is the most common cause of
microcytic hypochromic anemia and is classically associated with pica,
fatigue, and pallor due to reduced hemoglobin synthesis.
2.
,Which structure is primarily responsible for filtering blood in the
spleen?
A. Red pulp
B. White pulp
C. Trabeculae
D. Capsule
Answer: A. Red pulp
Rationale: The red pulp of the spleen is responsible for filtering aged
or damaged red blood cells, while white pulp is involved in immune
responses.
3.
A patient has difficulty abducting the arm past 15 degrees. Which
muscle is most likely injured?
A. Deltoid
B. Supraspinatus
C. Infraspinatus
D. Teres minor
,Answer: B. Supraspinatus
Rationale: The supraspinatus initiates the first 15 degrees of arm
abduction; after that, the deltoid takes over.
4.
Which neurotransmitter is decreased in Parkinson disease?
A. Serotonin
B. Dopamine
C. Acetylcholine
D. GABA
Answer: B. Dopamine
Rationale: Parkinson disease is caused by degeneration of
dopaminergic neurons in the substantia nigra, leading to dopamine
deficiency.
5.
Which vitamin deficiency causes beriberi?
A. Vitamin B1
B. Vitamin B2
, C. Vitamin B6
D. Vitamin B12
Answer: A. Vitamin B1
Rationale: Thiamine (B1) deficiency leads to beriberi, affecting
cardiovascular and neurological systems.
6.
What is the primary site of gas exchange in the lungs?
A. Bronchi
B. Alveoli
C. Trachea
D. Bronchioles
Answer: B. Alveoli
Rationale: Alveoli provide a large surface area and thin membrane
ideal for diffusion of oxygen and carbon dioxide.
7.
Which artery supplies the anterior two-thirds of the spinal cord?
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1.
A 22-year-old student presents with fatigue, pallor, and pica. Lab results
show microcytic hypochromic anemia. Which is the most likely cause?
A. Vitamin B12 deficiency
B. Iron deficiency
C. Aplastic anemia
D. Folate deficiency
Answer: B. Iron deficiency
Rationale: Iron deficiency anemia is the most common cause of
microcytic hypochromic anemia and is classically associated with pica,
fatigue, and pallor due to reduced hemoglobin synthesis.
2.
,Which structure is primarily responsible for filtering blood in the
spleen?
A. Red pulp
B. White pulp
C. Trabeculae
D. Capsule
Answer: A. Red pulp
Rationale: The red pulp of the spleen is responsible for filtering aged
or damaged red blood cells, while white pulp is involved in immune
responses.
3.
A patient has difficulty abducting the arm past 15 degrees. Which
muscle is most likely injured?
A. Deltoid
B. Supraspinatus
C. Infraspinatus
D. Teres minor
,Answer: B. Supraspinatus
Rationale: The supraspinatus initiates the first 15 degrees of arm
abduction; after that, the deltoid takes over.
4.
Which neurotransmitter is decreased in Parkinson disease?
A. Serotonin
B. Dopamine
C. Acetylcholine
D. GABA
Answer: B. Dopamine
Rationale: Parkinson disease is caused by degeneration of
dopaminergic neurons in the substantia nigra, leading to dopamine
deficiency.
5.
Which vitamin deficiency causes beriberi?
A. Vitamin B1
B. Vitamin B2
, C. Vitamin B6
D. Vitamin B12
Answer: A. Vitamin B1
Rationale: Thiamine (B1) deficiency leads to beriberi, affecting
cardiovascular and neurological systems.
6.
What is the primary site of gas exchange in the lungs?
A. Bronchi
B. Alveoli
C. Trachea
D. Bronchioles
Answer: B. Alveoli
Rationale: Alveoli provide a large surface area and thin membrane
ideal for diffusion of oxygen and carbon dioxide.
7.
Which artery supplies the anterior two-thirds of the spinal cord?
