Question 1

Which of the following best describes the function of the atrioventricular (AV) valves in the heart?

Accepted Answer

They prevent backflow of blood from the ventricles into the atria during ventricular contraction.

Question 2

A patient is diagnosed with valvular stenosis. Which of the following best explains the physiological consequence of this condition?

Accepted Answer

The heart must exert more force to pump blood through the narrowed valve opening.

Question 3

Which chamber of the heart receives oxygenated blood directly from the lungs?

Accepted Answer

Left atrium

Question 4

Why are the walls of the left ventricle significantly thicker than those of the right ventricle?

Accepted Answer

The left ventricle must generate higher pressure to pump blood through the systemic circuit.

Question 5

Which of the following is the correct sequence of blood flow through the right side of the heart?

Accepted Answer

Superior vena cava → Right atrium → Tricuspid valve → Right ventricle → Pulmonary semilunar valve → Pulmonary trunk

Question 6

A patient has an incompetent mitral valve. What is the most likely immediate effect on cardiac function?

Accepted Answer

Blood will regurgitate from the left ventricle into the left atrium during ventricular contraction.

Question 7

Which of the following statements about coronary circulation is correct?

Accepted Answer

The left ventricle receives most of the coronary blood supply.

Question 8

Which structure anchors the chordae tendineae to the ventricular wall?

Accepted Answer

Papillary muscles

Question 9

If the pulmonary semilunar valve fails to close properly, what is the most likely consequence?

Accepted Answer

Blood will flow back into the right ventricle from the pulmonary trunk during ventricular relaxation.

Question 10

Which of the following best explains why the pulmonary circuit is a low-pressure system compared to the systemic circuit?

Accepted Answer

The pulmonary circuit is shorter and has less resistance to blood flow.

Question 11

A patient presents with a blockage in the coronary arteries. Which tissue is most at risk for damage?

Accepted Answer

Myocardium

Question 12

Which of the following is a function of the endocardium?

Accepted Answer

It lines the heart chambers and is continuous with the endothelial lining of blood vessels.

Question 13

Which of the following best describes the anatomical location of the heart?

Accepted Answer

In the mediastinum, anterior to the vertebral column and posterior to the sternum

Question 14

Which of the following is the correct order of blood flow through the left side of the heart?

Accepted Answer

Pulmonary veins → Left atrium → Mitral valve → Left ventricle → Aortic semilunar valve → Aorta

Question 15

Which of the following statements about the heart's double pump function is correct?

Accepted Answer

Each side of the heart supplies its own circuit, pumping equal volumes of blood.

Question 16

Which of the following best describes the function of the auricles of the atria?

Accepted Answer

They increase the volume capacity of the atria.

Question 17

A patient with a defective tricuspid valve would most likely experience which of the following?

Accepted Answer

Backflow of blood from the right ventricle into the right atrium during ventricular contraction.

Question 18

Which of the following best explains why the heart muscle (myocardium) receives blood primarily when the heart is relaxed?

Accepted Answer

Coronary arteries are compressed during ventricular contraction, reducing blood flow.

Question 19

Which of the following is a direct result of an incompetent valve in the heart?

Accepted Answer

Blood backflows, causing the heart to repump the same blood repeatedly.

Question 20

Which of the following best describes the role of the interventricular septum?

Accepted Answer

It separates the right and left ventricles.

The Cardiovascular System: The Heart – Structure, Function, and Circulation

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