ATI ALTERATIONS IN CARDIOVASCULAR FUNCTION & PERFUSION: COMPREHENSIVE EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
250
Section 1: Anatomy & Physiology of the Cardiovascular System
(Questions 1–25)
1. Which chamber of the heart has the thickest myocardium and is responsible for pumping
oxygenated blood to the systemic circulation?
A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle
Answer D: Left ventricle
Rationale: The left ventricle has the thickest myocardium to generate the force needed to pump blood
through the systemic circulation.
2. The valve that prevents backflow of blood from the left ventricle into the left atrium is the:
A) Aortic valve
B) Pulmonic valve
C) Mitral (bicuspid) valve
D) Tricuspid valve
Answer C: Mitral (bicuspid) valve
,Rationale: The mitral valve separates the left atrium from the left ventricle and prevents backflow during
ventricular systole.
3. Which structure is responsible for the intrinsic rhythmicity of the heart?
A) Atrioventricular (AV) node
B) Bundle of His
C) Purkinje fibers
D) Sinoatrial (SA) node
Answer D: Sinoatrial (SA) node
Rationale: The SA node is the primary pacemaker of the heart, generating impulses at 60–100 beats per
minute.
4. The coronary arteries originate from the:
A) Pulmonary artery
B) Base of the aorta
C) Superior vena cava
D) Left ventricle
Answer B: Base of the aorta
Rationale: The coronary arteries arise from the base of the aorta, just above the aortic valve, and supply
oxygen-rich blood to the heart muscle.
5. The fibrous sac that surrounds and anchors the heart in the thorax is the:
A) Endocardium
B) Myocardium
C) Epicardium
D) Pericardium
Answer D: Pericardium
Rationale: The pericardium is a fibrous sac that surrounds the heart, anchoring it in the thorax and allowing
smooth movement between its layers due to serous fluid.
6. Which cardiac structure receives deoxygenated blood from the body via the superior and inferior
vena cava?
,A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
Answer B: Right atrium
Rationale: The right atrium receives deoxygenated blood from the systemic circulation via the superior and
inferior vena cava.
7. The semilunar valves include the:
A) Mitral and tricuspid valves
B) Aortic and pulmonic valves
C) Bicuspid and tricuspid valves
D) Mitral and aortic valves
Answer B: Aortic and pulmonic valves
Rationale: The aortic and pulmonic valves are semilunar valves that prevent backflow into the ventricles
after blood is ejected.
8. Normal cardiac output for an adult is approximately:
A) 2–4 L/min
B) 4–8 L/min
C) 8–12 L/min
D) 12–16 L/min
Answer B: 4–8 L/min
Rationale: Normal cardiac output ranges from 4 to 8 L/min, depending on body size and metabolic demand.
9. The P wave on an ECG represents:
A) Ventricular depolarization
B) Ventricular repolarization
C) Atrial depolarization
D) Atrial repolarization
Answer C: Atrial depolarization
Rationale: The P wave represents atrial depolarization, the electrical activation of the atria.
, 10. The QRS complex on an ECG represents:
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer B: Ventricular depolarization
Rationale: The QRS complex represents ventricular depolarization, which triggers ventricular contraction.
11. The T wave on an ECG represents:
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer C: Ventricular repolarization
Rationale: The T wave represents ventricular repolarization, the recovery phase of the ventricles.
12. What is the normal duration of the QRS complex?
A) 0.04–0.08 seconds
B) 0.06–0.10 seconds
C) 0.10–0.14 seconds
D) 0.14–0.18 seconds
Answer B: 0.06–0.10 seconds
Rationale: Normal QRS duration is 0.06 to 0.10 seconds, measured from the start to the end of the QRS
complex.
13. The normal PR interval duration is:
A) 0.04–0.08 seconds
B) 0.12–0.20 seconds
C) 0.20–0.28 seconds
D) 0.28–0.36 seconds
Answer B: 0.12–0.20 seconds
AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
250
Section 1: Anatomy & Physiology of the Cardiovascular System
(Questions 1–25)
1. Which chamber of the heart has the thickest myocardium and is responsible for pumping
oxygenated blood to the systemic circulation?
A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle
Answer D: Left ventricle
Rationale: The left ventricle has the thickest myocardium to generate the force needed to pump blood
through the systemic circulation.
2. The valve that prevents backflow of blood from the left ventricle into the left atrium is the:
A) Aortic valve
B) Pulmonic valve
C) Mitral (bicuspid) valve
D) Tricuspid valve
Answer C: Mitral (bicuspid) valve
,Rationale: The mitral valve separates the left atrium from the left ventricle and prevents backflow during
ventricular systole.
3. Which structure is responsible for the intrinsic rhythmicity of the heart?
A) Atrioventricular (AV) node
B) Bundle of His
C) Purkinje fibers
D) Sinoatrial (SA) node
Answer D: Sinoatrial (SA) node
Rationale: The SA node is the primary pacemaker of the heart, generating impulses at 60–100 beats per
minute.
4. The coronary arteries originate from the:
A) Pulmonary artery
B) Base of the aorta
C) Superior vena cava
D) Left ventricle
Answer B: Base of the aorta
Rationale: The coronary arteries arise from the base of the aorta, just above the aortic valve, and supply
oxygen-rich blood to the heart muscle.
5. The fibrous sac that surrounds and anchors the heart in the thorax is the:
A) Endocardium
B) Myocardium
C) Epicardium
D) Pericardium
Answer D: Pericardium
Rationale: The pericardium is a fibrous sac that surrounds the heart, anchoring it in the thorax and allowing
smooth movement between its layers due to serous fluid.
6. Which cardiac structure receives deoxygenated blood from the body via the superior and inferior
vena cava?
,A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
Answer B: Right atrium
Rationale: The right atrium receives deoxygenated blood from the systemic circulation via the superior and
inferior vena cava.
7. The semilunar valves include the:
A) Mitral and tricuspid valves
B) Aortic and pulmonic valves
C) Bicuspid and tricuspid valves
D) Mitral and aortic valves
Answer B: Aortic and pulmonic valves
Rationale: The aortic and pulmonic valves are semilunar valves that prevent backflow into the ventricles
after blood is ejected.
8. Normal cardiac output for an adult is approximately:
A) 2–4 L/min
B) 4–8 L/min
C) 8–12 L/min
D) 12–16 L/min
Answer B: 4–8 L/min
Rationale: Normal cardiac output ranges from 4 to 8 L/min, depending on body size and metabolic demand.
9. The P wave on an ECG represents:
A) Ventricular depolarization
B) Ventricular repolarization
C) Atrial depolarization
D) Atrial repolarization
Answer C: Atrial depolarization
Rationale: The P wave represents atrial depolarization, the electrical activation of the atria.
, 10. The QRS complex on an ECG represents:
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer B: Ventricular depolarization
Rationale: The QRS complex represents ventricular depolarization, which triggers ventricular contraction.
11. The T wave on an ECG represents:
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer C: Ventricular repolarization
Rationale: The T wave represents ventricular repolarization, the recovery phase of the ventricles.
12. What is the normal duration of the QRS complex?
A) 0.04–0.08 seconds
B) 0.06–0.10 seconds
C) 0.10–0.14 seconds
D) 0.14–0.18 seconds
Answer B: 0.06–0.10 seconds
Rationale: Normal QRS duration is 0.06 to 0.10 seconds, measured from the start to the end of the QRS
complex.
13. The normal PR interval duration is:
A) 0.04–0.08 seconds
B) 0.12–0.20 seconds
C) 0.20–0.28 seconds
D) 0.28–0.36 seconds
Answer B: 0.12–0.20 seconds
