Question 1

Which layer of the heart is responsible for the majority of its contractile function and contains branching cardiac muscle fibers connected by intercalated discs?

Accepted Answer

Myocardium

Question 2

A patient presents with inflammation of the pericardium, causing painful friction with each heartbeat. What is the clinical term for this condition?

Accepted Answer

Pericarditis

Question 3

Which of the following best describes the function of the fibrous skeleton of the heart?

Accepted Answer

It provides structural support, anchors cardiac muscle cells, and insulates electrical signals between atria and ventricles.

Question 4

During the cardiac cycle, which valve prevents backflow of blood from the right ventricle into the right atrium?

Accepted Answer

Tricuspid (right AV) valve

Question 5

Which of the following correctly traces the pathway of blood through the heart starting from the right atrium?

Accepted Answer

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

Question 6

The 'Widow Maker' refers to a blockage in which coronary artery branch?

Accepted Answer

Anterior interventricular branch (LAD)

Question 7

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

Accepted Answer

They have a longer refractory period than skeletal muscle cells.

Question 8

A patient has a defect in the chordae tendineae. Which of the following is most likely to occur?

Accepted Answer

The AV valves may invert into the atria during ventricular contraction, causing regurgitation.

Question 9

Which equation best represents cardiac output ($$CO) in $$terms of heart rate ($$HR) $$and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

Which structure is responsible for initiating the electrical impulse that sets the pace of the heartbeat?

Accepted Answer

Sinoatrial (SA) node

Question 11

During ventricular relaxation, blood flow in the coronary arteries increases. What is the primary reason for this?

Accepted Answer

Contraction of the myocardium compresses the arteries and obstructs blood flow during systole.

Question 12

Which of the following is NOT a function of the pericardium?

Accepted Answer

Providing electrical insulation for the heart

Question 13

A blockage in the right coronary artery would most directly affect blood supply to which of the following?

Accepted Answer

Right atrium and sinoatrial (SA) node

Question 14

Which of the following best describes the role of intercalated discs in cardiac muscle?

Accepted Answer

They connect cardiac muscle cells, allowing synchronized contraction via gap junctions and desmosomes.

Question 15

If the left ventricle wall is abnormally thin, which of the following is most likely to occur?

Accepted Answer

The heart will be unable to pump blood effectively through the aorta.

Question 16

Which of the following is the correct sequence for the conduction pathway in the heart?

Accepted Answer

SA node → AV node → bundle branches → Purkinje fibers

Question 17

Which of the following statements about the heart valves is TRUE?

Accepted Answer

The semilunar valves prevent backflow from the arteries into the ventricles.

Question 18

A patient with a congenital defect in the interventricular septum would most likely experience which of the following?

Accepted Answer

Mixing of oxygenated and deoxygenated blood between the left and right ventricles

Question 19

Which of the following best explains why cardiac muscle cannot regenerate after injury?

Accepted Answer

Cardiac muscle cells do not contain satellite cells and repair is done by fibrosis (scarring).

Question 20

Which equation correctly represents the relationship between blood flow ($$Q$$), pressure difference ($$\Delta P$$), and resistance ($$R) in $$the cardiovascular system?

Accepted Answer

$$Q = \Delta P / R$$

Anatomy and Physiology: The Cardiovascular System – Heart Structure and Function

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