CARDIOVASCULAR CREDENTIALING INTERNATIONAL (CCI)
EXAM|QUESTIONS AND ANSWERS |2026|2027
UPDATES|WITH COMPLETE SOLUTIONS
SECTION 1: CORE CARDIAC ANATOMY AND PHYSIOLOGY (Questions 140)
1. The left main coronary artery typically bifurcates into which two vessels?
A) Right coronary artery and circumflex artery
B) Left anterior descending artery and right coronary artery
C) Left anterior descending artery and circumflex artery
D) Posterior descending artery and obtuse marginal artery
Correct Answer: C
Rationale: The left main coronary artery arises from the left coronary cusp and
divides into the left anterior descending (LAD) artery and the left circumflex (LCx)
artery. The LAD supplies the anterior interventricular septum and anterior left
ventricular wall, while the LCx supplies the lateral and posterior left ventricular
wall.
2. Which coronary artery supplies the sinoatrial node in approximately 60% of the
population?
,A) Left anterior descending artery
B) Left circumflex artery
C) Right coronary artery
D) Posterior descending artery
Correct Answer: C
Rationale: The right coronary artery (RCA) supplies the sinoatrial node in about
60% of individuals via the sinus node branch. In the remaining 40%, the left
circumflex artery provides this supply.
3. The left ventricular wall is thickest because it:
A) Pumps blood to the pulmonary circulation
B) Must generate high pressure to overcome systemic vascular resistance
C) Receives blood directly from the pulmonary veins
D) Has a smaller chamber volume than the right ventricle
Correct Answer: B
Rationale: The left ventricle has the thickest myocardial wall because it must
generate sufficient pressure (approximately 120 mmHg systolic) to overcome
systemic vascular resistance and eject blood throughout the entire body.
,4. What is the normal pulmonary artery systolic pressure?
A) 1525 mmHg
B) 2030 mmHg
C) 2535 mmHg
D) 3040 mmHg
Correct Answer: B
Rationale: Normal pulmonary artery systolic pressure ranges from 2030 mmHg,
with a mean pressure of 1015 mmHg. Elevated pressures indicate pulmonary
hypertension and may suggest leftsided heart disease or pulmonary pathology.
5. The bundle of His is located in which cardiac structure?
A) Atrial septum
B) Ventricular septum
C) Interventricular septum, near the tricuspid valve
D) Apex of the heart
Correct Answer: C
Rationale: The bundle of His is located in the interventricular septum near the
tricuspid valve. It receives impulses from the atrioventricular node and divides
into the right and left bundle branches to conduct electrical signals to the
ventricular myocardium.
, 6. Preload is best defined as:
A) The resistance the ventricle must overcome to eject blood
B) The volume of blood in the ventricle at enddiastole
C) The force of myocardial contraction
D) The heart rate multiplied by stroke volume
Correct Answer: B
Rationale: Preload represents the volume of blood in the ventricle at enddiastole
(enddiastolic volume). It reflects the degree of myocardial stretch before
contraction and is influenced by venous return and atrial contraction.
7. Afterload is best defined as:
A) The volume of blood in the ventricle at enddiastole
B) The resistance the ventricle must overcome to eject blood
C) The force generated during myocardial contraction
D) The pressure generated in the aorta during systole
Correct Answer: B
EXAM|QUESTIONS AND ANSWERS |2026|2027
UPDATES|WITH COMPLETE SOLUTIONS
SECTION 1: CORE CARDIAC ANATOMY AND PHYSIOLOGY (Questions 140)
1. The left main coronary artery typically bifurcates into which two vessels?
A) Right coronary artery and circumflex artery
B) Left anterior descending artery and right coronary artery
C) Left anterior descending artery and circumflex artery
D) Posterior descending artery and obtuse marginal artery
Correct Answer: C
Rationale: The left main coronary artery arises from the left coronary cusp and
divides into the left anterior descending (LAD) artery and the left circumflex (LCx)
artery. The LAD supplies the anterior interventricular septum and anterior left
ventricular wall, while the LCx supplies the lateral and posterior left ventricular
wall.
2. Which coronary artery supplies the sinoatrial node in approximately 60% of the
population?
,A) Left anterior descending artery
B) Left circumflex artery
C) Right coronary artery
D) Posterior descending artery
Correct Answer: C
Rationale: The right coronary artery (RCA) supplies the sinoatrial node in about
60% of individuals via the sinus node branch. In the remaining 40%, the left
circumflex artery provides this supply.
3. The left ventricular wall is thickest because it:
A) Pumps blood to the pulmonary circulation
B) Must generate high pressure to overcome systemic vascular resistance
C) Receives blood directly from the pulmonary veins
D) Has a smaller chamber volume than the right ventricle
Correct Answer: B
Rationale: The left ventricle has the thickest myocardial wall because it must
generate sufficient pressure (approximately 120 mmHg systolic) to overcome
systemic vascular resistance and eject blood throughout the entire body.
,4. What is the normal pulmonary artery systolic pressure?
A) 1525 mmHg
B) 2030 mmHg
C) 2535 mmHg
D) 3040 mmHg
Correct Answer: B
Rationale: Normal pulmonary artery systolic pressure ranges from 2030 mmHg,
with a mean pressure of 1015 mmHg. Elevated pressures indicate pulmonary
hypertension and may suggest leftsided heart disease or pulmonary pathology.
5. The bundle of His is located in which cardiac structure?
A) Atrial septum
B) Ventricular septum
C) Interventricular septum, near the tricuspid valve
D) Apex of the heart
Correct Answer: C
Rationale: The bundle of His is located in the interventricular septum near the
tricuspid valve. It receives impulses from the atrioventricular node and divides
into the right and left bundle branches to conduct electrical signals to the
ventricular myocardium.
, 6. Preload is best defined as:
A) The resistance the ventricle must overcome to eject blood
B) The volume of blood in the ventricle at enddiastole
C) The force of myocardial contraction
D) The heart rate multiplied by stroke volume
Correct Answer: B
Rationale: Preload represents the volume of blood in the ventricle at enddiastole
(enddiastolic volume). It reflects the degree of myocardial stretch before
contraction and is influenced by venous return and atrial contraction.
7. Afterload is best defined as:
A) The volume of blood in the ventricle at enddiastole
B) The resistance the ventricle must overcome to eject blood
C) The force generated during myocardial contraction
D) The pressure generated in the aorta during systole
Correct Answer: B
