Question 1

Which layer of the heart wall is responsible for the contractile force that pumps blood throughout the body?

Accepted Answer

Myocardium

Question 2

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

Accepted Answer

The heart must exert more force to pump blood through a narrowed valve

Question 3

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

Accepted Answer

Left atrium

Question 4

What is the primary function of the chordae tendineae in the heart?

Accepted Answer

To anchor the atrioventricular valve flaps and prevent valve prolapse

Question 5

During ventricular systole, which valves are open and which are closed?

Accepted Answer

Atrioventricular valves closed, semilunar valves open

Question 6

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

It pumps blood to the entire body, requiring greater pressure

Question 7

A blockage in the coronary arteries would most directly affect which part of the heart?

Accepted Answer

The myocardium

Question 8

Which of the following is the correct sequence of blood flow through the heart, starting from the vena cava?

Accepted Answer

Right atrium → right ventricle → pulmonary trunk → lungs → left atrium → left ventricle → aorta

Question 9

Which structure prevents backflow of blood from the aorta into the left ventricle?

Accepted Answer

Aortic semilunar valve

Question 10

If the pericardial fluid volume increases abnormally, what is the most likely consequence?

Accepted Answer

Compression of the heart, reducing its ability to fill and pump (cardiac tamponade)

Question 11

Which of the following best describes the function of the coronary sinus?

Accepted Answer

It returns deoxygenated blood from the myocardium to the right atrium

Question 12

A patient with an incompetent mitral valve is likely to experience which of the following?

Accepted Answer

Backflow of blood into the left atrium during ventricular contraction

Question 13

Which of the following statements about the pulmonary circuit is correct?

Accepted Answer

It carries oxygen-poor blood from the right ventricle to the lungs

Question 14

Which anatomical feature increases the volume capacity of the atria?

Accepted Answer

Auricles

Question 15

Which of the following best explains why coronary circulation is delivered when the heart is relaxed?

Accepted Answer

Coronary arteries are compressed during ventricular contraction

Question 16

Which of the following is a direct result of the left ventricle pumping blood into the aorta?

Accepted Answer

Oxygen-rich blood is distributed to the systemic circuit

Question 17

Which of the following best describes the function of the semilunar valves?

Accepted Answer

They prevent backflow of blood from the arteries into the ventricles

Question 18

A patient has a defective tricuspid valve. Which of the following is a likely consequence?

Accepted Answer

Backflow of blood into the right atrium during right ventricular contraction

Question 19

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

Accepted Answer

It separates the left and right ventricles

Question 20

Which of the following is true regarding the coronary arteries?

Accepted Answer

They arise from the base of the aorta and encircle the heart at the coronary sulcus

The Heart: Structure, Function, and Circulation

Study Guide - Practice Questions