2: Module 4 Exam Questions and

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Portage Learning Anatomy & Physiology

2: Module 4 Exam Questions and

Answers | Latest Version | 2025/2026 | Correct & Verified

What is the function of the atrioventricular (AV) valves in the heart?

• Prevent blood from flowing into the atria during contraction

✔✔ B. Prevent backflow of blood from ventricles to atria

• Pump blood into the pulmonary artery
• Increase blood pressure in the atria

Which of the following structures initiates the heartbeat?✔✔ A. Sinoatrial (SA) node

• Atrioventricular (AV) node
• Purkinje fibers
• Bundle of His

What is the thickest layer of the heart wall?

• Endocardium 1 / 3

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✔✔ B. Myocardium

• Pericardium
• Epicardium

Which blood vessels carry blood away from the heart?

• Veins
• Capillaries

✔✔ C. Arteries

• Venules

What causes the “lub” sound during the cardiac cycle?✔✔ A. Closing of the AV valves

• Closing of the semilunar valves
• Opening of the tricuspid valve
• Relaxation of the ventricles

What is the purpose of coronary circulation?✔✔ A. To supply the heart muscle with oxygen and nutrients 2 / 3

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• To move blood from the lungs to the left atrium
• To pump blood into the pulmonary arteries
• To increase pressure in the ventricles

Which part of the ECG represents ventricular depolarization?

• P wave

✔✔ B. QRS complex

• T wave
• ST segment

What type of blood vessel has the thickest muscular layer?✔✔ A. Arteries

• Veins
• Capillaries
• Venules

Which chamber of the heart receives oxygen-rich blood from the lungs?✔✔ A. Left atrium

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