Question 1

Which of the following best describes the function of the pulmonary circuit in the heart?

Accepted Answer

It pumps oxygen-poor blood from the right heart to the lungs for gas exchange.

Question 2

A patient presents with pericarditis. Which of the following symptoms is most directly caused by the roughening of the pericardial membrane surfaces?

Accepted Answer

A creaking sound (pericardial friction rub) heard with a stethoscope.

Question 3

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

Accepted Answer

Myocardium

Question 4

During ventricular contraction, which heart valves are open and which are closed?

Accepted Answer

AV valves are closed; semilunar valves are open.

Question 5

Which anatomical feature prevents the backflow of blood from the ventricles into the atria during ventricular contraction?

Accepted Answer

Chordae tendineae attached to AV valves

Question 6

A patient is diagnosed with valvular stenosis. What is the primary consequence of this condition?

Accepted Answer

The valve does not open fully, increasing the workload on the heart.

Question 7

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

Accepted Answer

The left ventricle pumps blood to the entire body, requiring higher pressure.

Question 8

Which of the following statements about cardiac muscle cells is TRUE?

Accepted Answer

Cardiac muscle cells are connected by intercalated discs, allowing them to function as a syncytium.

Question 9

Which equation best represents the relationship between cardiac output ($$CO$$), heart rate ($$HR$$), and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

A blockage in the left anterior descending (LAD) artery would most likely result in which clinical condition?

Accepted Answer

Myocardial infarction affecting the left ventricle

Question 11

Which of the following is a key difference between cardiac and skeletal muscle physiology?

Accepted Answer

Cardiac muscle relies almost exclusively on aerobic respiration.

Question 12

Which structure collects deoxygenated blood from the heart muscle and empties it into the right atrium?

Accepted Answer

Coronary sinus

Question 13

Which of the following best explains why tetanic contractions cannot occur in cardiac muscle?

Accepted Answer

Cardiac muscle fibers have a longer absolute refractory period than skeletal muscle fibers.

Question 14

Which of the following is TRUE regarding the function of the semilunar valves?

Accepted Answer

They open when ventricular pressure exceeds arterial pressure.

Question 15

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

Accepted Answer

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

Question 16

Which of the following best describes the role of pacemaker cells in cardiac muscle?

Accepted Answer

They spontaneously depolarize to initiate the heartbeat.

Question 17

Which of the following statements about the pericardium is correct?

Accepted Answer

The pericardial cavity is the space between the fibrous and serous layers of the pericardium.

Question 18

Which of the following is a correct sequence for the flow of blood through the heart and lungs?

Accepted Answer

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

Question 19

Which of the following features is unique to cardiac muscle and allows for rapid electrical communication between cells?

Accepted Answer

Gap junctions

Question 20

If the coronary arteries are blocked, which of the following is the most likely outcome?

Accepted Answer

Decreased oxygen delivery to the heart muscle, leading to myocardial infarction.

Heart Anatomy and Physiology: Structure, Circulation, and Location

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