Page 1 of 111
,Page 2 of 111
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Q1. Which layer of the heart contains the Purkinje fibers?
A) Epicardium
B) Myocardium
C) Endocardium
D) Pericardium
Answer: C
Rationale: Purkinje fibers are located in the subendocardium,
just beneath the endocardium.
Q2. Normal SA node automaticity rate is:
A) 20–40 bpm
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B) 40–60 bpm
C) 60–100 bpm
D) 100–120 bpm
Answer: C
Q3. Which ion is primarily responsible for phase 2 (plateau)
of the cardiac action potential?
A) Sodium
B) Potassium
C) Calcium
D) Chloride
Answer: C — Calcium influx via L-type channels balances
potassium efflux.
Q4. The AV node is located in which triangle?
A) Triangle of Koch
B) Eberth’s triangle
C) Calot’s triangle
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D) Hesselbach’s triangle
Answer: A
Q5. Which channelopathy causes Long QT syndrome type 1?
A) KCNQ1 mutation (Iₖₛ)
B) KCNH2 mutation (Iₖᵣ)
C) SCN5A mutation (Na channel)
D) CACNA1C mutation
Answer: A
Q6. The fastest intrinsic firing rate belongs to:
A) SA node
B) AV node
C) His bundle
D) Purkinje fibers
Answer: A
Q7. Brugada syndrome is associated with which ion channel
mutation?
A) Potassium
,Page 2 of 111
Ibhre Ceps Final Exam Newest Actual Exam
With Complete Questions And Correct
Detailed Answers (Verified Answers)
||Complete A+ Guide
Q1. Which layer of the heart contains the Purkinje fibers?
A) Epicardium
B) Myocardium
C) Endocardium
D) Pericardium
Answer: C
Rationale: Purkinje fibers are located in the subendocardium,
just beneath the endocardium.
Q2. Normal SA node automaticity rate is:
A) 20–40 bpm
,Page 3 of 111
B) 40–60 bpm
C) 60–100 bpm
D) 100–120 bpm
Answer: C
Q3. Which ion is primarily responsible for phase 2 (plateau)
of the cardiac action potential?
A) Sodium
B) Potassium
C) Calcium
D) Chloride
Answer: C — Calcium influx via L-type channels balances
potassium efflux.
Q4. The AV node is located in which triangle?
A) Triangle of Koch
B) Eberth’s triangle
C) Calot’s triangle
, Page 4 of 111
D) Hesselbach’s triangle
Answer: A
Q5. Which channelopathy causes Long QT syndrome type 1?
A) KCNQ1 mutation (Iₖₛ)
B) KCNH2 mutation (Iₖᵣ)
C) SCN5A mutation (Na channel)
D) CACNA1C mutation
Answer: A
Q6. The fastest intrinsic firing rate belongs to:
A) SA node
B) AV node
C) His bundle
D) Purkinje fibers
Answer: A
Q7. Brugada syndrome is associated with which ion channel
mutation?
A) Potassium
