Question 1

Which of the following best describes the function of the pericardial cavity?

Accepted Answer

It reduces friction between the heart and surrounding tissues by containing serous fluid.

Question 2

A patient is diagnosed with valvular heart disease (VHD) due to inflammation of the heart. Which structure is most likely compromised?

Accepted Answer

The atrioventricular or semilunar valves

Question 3

Which layer of the heart is responsible for producing the serous fluid found in the pericardial cavity?

Accepted Answer

Epicardium (visceral pericardium)

Question 4

During fetal development, the foramen ovale allows blood to flow directly between which two structures?

Accepted Answer

Right atrium and left atrium

Question 5

Which of the following statements about the cardiac skeleton is correct?

Accepted Answer

It stabilizes the heart valves and electrically insulates atria from ventricles.

Question 6

A blockage in the anterior interventricular artery would most directly affect which region of the heart?

Accepted Answer

Left ventricle and interventricular septum

Question 7

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

Accepted Answer

It pumps blood to the entire systemic circuit, requiring greater force.

Question 8

Which structure prevents the atrioventricular valve cusps from inverting into the atria during ventricular contraction?

Accepted Answer

Chordae tendineae attached to papillary muscles

Question 9

A patient has a congenital defect where the ligamentum arteriosum remains open after birth. What is the likely consequence?

Accepted Answer

Blood will bypass the lungs, leading to poor oxygenation.

Question 10

Which of the following is a unique feature of cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

Branching interconnections and intercalated discs

Question 11

Which vessel returns deoxygenated blood from the myocardium directly to the right atrium?

Accepted Answer

Coronary sinus

Question 12

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

Accepted Answer

They prevent backflow from the arteries into the ventricles.

Question 13

If the right coronary artery is blocked, which of the following regions is most likely to be affected?

Accepted Answer

Right atrium and portions of both ventricles

Question 14

Which of the following is TRUE regarding the endocardium?

Accepted Answer

It is composed of simple squamous epithelium continuous with the endothelium of great vessels.

Question 15

Which chamber of the heart receives blood from the pulmonary veins?

Accepted Answer

Left atrium

Question 16

Which anatomical feature marks the boundary between the atria and ventricles on the external surface of the heart?

Accepted Answer

Coronary sulcus

Question 17

Which of the following best explains why the semilunar valves do not require muscular braces like the AV valves?

Accepted Answer

The arteries do not contract, so the valves are not at risk of inversion.

Question 18

Which of the following is a function of the connective tissue fibers in the heart?

Accepted Answer

They distribute forces of contraction and add strength to the heart.

Question 19

A patient with a damaged moderator band would most likely experience which of the following?

Accepted Answer

Impaired coordination of papillary muscle contraction in the right ventricle

Question 20

Which of the following equations correctly represents the relationship between cardiac output (CO), heart rate (HR), and stroke volume (SV)?

Accepted Answer

$$CO = HR 	imes SV$$

Ch 20 pt.1: Anatomy of the Heart: Structure and Organization

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