COMSAE Phase 1 – Form ASA 114 (Secure
Browser Testing Standard) (2026 Edition):
Comprehensive Multiple-Choice Questions,
Answers, and Detailed Rationales
Question 1
A 62-year-old man presents with exertional chest pain
relieved by rest. Coronary angiography reveals significant
stenosis of the left anterior descending artery. Which process
most likely initiated the development of this lesion?
A. Smooth muscle hyperplasia
B. Fibrous cap rupture
C. Endothelial injury and dysfunction
D. Platelet destruction
E. Vasospasm
Rationale: Endothelial injury and dysfunction is the earliest
step in atherosclerosis. It promotes lipid accumulation,
leukocyte adhesion, and plaque formation. Smooth muscle
proliferation and fibrous cap formation occur later in lesion
development.
Question 2
,A researcher studies a hormone that increases glucose
production, lipolysis, and protein catabolism during fasting.
Which hormone is being investigated?
A. Insulin
B. Aldosterone
C. Cortisol
D. Oxytocin
E. Prolactin
Rationale: Cortisol promotes gluconeogenesis, protein
breakdown, and lipolysis during stress and fasting states. It
helps maintain blood glucose levels during periods of
metabolic demand.
Question 3
A patient develops weakness when attempting to abduct the
arm from 15° to 90°. Which muscle is most likely affected?
A. Supraspinatus
B. Teres major
C. Latissimus dorsi
D. Deltoid
E. Pectoralis major
Rationale: Deltoid is responsible for arm abduction from
approximately 15° to 90°. The supraspinatus initiates the first
15° of abduction.
Question 4
,A child with recurrent respiratory infections is found to have
defective ciliary motility. Which microtubule arrangement is
normally present in motile cilia?
A. 9+0
B. 13 protofilaments only
C. 8+1
D. 10+2
E. 9+2
Rationale: 9+2 refers to nine peripheral microtubule doublets
surrounding two central microtubules. Defects in dynein arms
can cause primary ciliary dyskinesia.
Question 5
A patient experiences sudden onset dyspnea after prolonged
immobilization. A pulmonary embolism is suspected. Which
vessel is the most common source of emboli?
A. Radial veins
B. Hepatic veins
C. Internal jugular vein
D. Deep veins of the lower extremities
E. Coronary veins
Rationale: Deep veins of the lower extremities are the most
common source of pulmonary emboli, particularly the
femoral and popliteal venous systems.
Question 6
, A medication competitively inhibits an enzyme. Increasing
substrate concentration reverses the inhibition. What
happens to the enzyme's apparent Km?
A. Decreases
B. Becomes zero
C. Remains unchanged
D. Cannot be measured
E. Increases
Rationale: Competitive inhibition increases the apparent Km
because more substrate is required to achieve half-maximal
velocity. Vmax remains unchanged.
Question 7
Which cranial nerve carries parasympathetic fibers
responsible for pupillary constriction?
A. CN II
B. CN IV
C. CN V
D. CN III
E. CN XII
Rationale: CN III (oculomotor nerve) contains
parasympathetic fibers originating from the Edinger-
Westphal nucleus that constrict the pupil via the sphincter
pupillae muscle.
Question 8
Browser Testing Standard) (2026 Edition):
Comprehensive Multiple-Choice Questions,
Answers, and Detailed Rationales
Question 1
A 62-year-old man presents with exertional chest pain
relieved by rest. Coronary angiography reveals significant
stenosis of the left anterior descending artery. Which process
most likely initiated the development of this lesion?
A. Smooth muscle hyperplasia
B. Fibrous cap rupture
C. Endothelial injury and dysfunction
D. Platelet destruction
E. Vasospasm
Rationale: Endothelial injury and dysfunction is the earliest
step in atherosclerosis. It promotes lipid accumulation,
leukocyte adhesion, and plaque formation. Smooth muscle
proliferation and fibrous cap formation occur later in lesion
development.
Question 2
,A researcher studies a hormone that increases glucose
production, lipolysis, and protein catabolism during fasting.
Which hormone is being investigated?
A. Insulin
B. Aldosterone
C. Cortisol
D. Oxytocin
E. Prolactin
Rationale: Cortisol promotes gluconeogenesis, protein
breakdown, and lipolysis during stress and fasting states. It
helps maintain blood glucose levels during periods of
metabolic demand.
Question 3
A patient develops weakness when attempting to abduct the
arm from 15° to 90°. Which muscle is most likely affected?
A. Supraspinatus
B. Teres major
C. Latissimus dorsi
D. Deltoid
E. Pectoralis major
Rationale: Deltoid is responsible for arm abduction from
approximately 15° to 90°. The supraspinatus initiates the first
15° of abduction.
Question 4
,A child with recurrent respiratory infections is found to have
defective ciliary motility. Which microtubule arrangement is
normally present in motile cilia?
A. 9+0
B. 13 protofilaments only
C. 8+1
D. 10+2
E. 9+2
Rationale: 9+2 refers to nine peripheral microtubule doublets
surrounding two central microtubules. Defects in dynein arms
can cause primary ciliary dyskinesia.
Question 5
A patient experiences sudden onset dyspnea after prolonged
immobilization. A pulmonary embolism is suspected. Which
vessel is the most common source of emboli?
A. Radial veins
B. Hepatic veins
C. Internal jugular vein
D. Deep veins of the lower extremities
E. Coronary veins
Rationale: Deep veins of the lower extremities are the most
common source of pulmonary emboli, particularly the
femoral and popliteal venous systems.
Question 6
, A medication competitively inhibits an enzyme. Increasing
substrate concentration reverses the inhibition. What
happens to the enzyme's apparent Km?
A. Decreases
B. Becomes zero
C. Remains unchanged
D. Cannot be measured
E. Increases
Rationale: Competitive inhibition increases the apparent Km
because more substrate is required to achieve half-maximal
velocity. Vmax remains unchanged.
Question 7
Which cranial nerve carries parasympathetic fibers
responsible for pupillary constriction?
A. CN II
B. CN IV
C. CN V
D. CN III
E. CN XII
Rationale: CN III (oculomotor nerve) contains
parasympathetic fibers originating from the Edinger-
Westphal nucleus that constrict the pupil via the sphincter
pupillae muscle.
Question 8
