Question 1

Which of the following best describes the function of the right side of the heart?

Accepted Answer

It receives oxygen-poor blood from the tissues and pumps it to the lungs via the pulmonary circuit.

Question 2

A patient presents with a creaking sound heard with a stethoscope and chest pain. Which condition is most likely present, and what is the underlying cause?

Accepted Answer

Pericarditis; inflammation of the pericardium causing roughened membrane surfaces.

Question 3

Which anatomical feature separates the right and left atria of the heart?

Accepted Answer

Interatrial septum

Question 4

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

Accepted Answer

To prevent the atrioventricular valve flaps from everting into the atria during ventricular contraction

Question 5

Which of the following statements about the myocardium is correct?

Accepted Answer

It is composed of circular or spiral bundles of contractile cardiac muscle cells.

Question 6

A patient is diagnosed with cardiac tamponade. What is the most immediate threat to the patient’s health?

Accepted Answer

Compression of the heart's pumping ability due to excess fluid in the pericardial space

Question 7

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

Accepted Answer

It pumps blood with greater pressure to overcome the higher resistance of the systemic circuit.

Question 8

Which of the following is true regarding the coronary circulation?

Accepted Answer

It provides the functional blood supply to the heart muscle itself.

Question 9

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

Accepted Answer

Cardiac muscle can contract without nervous system stimulation due to pacemaker cells.

Question 10

A patient with an incompetent mitral valve would most likely experience which of the following?

Accepted Answer

Blood backflow into the left atrium during ventricular contraction

Question 11

Which of the following best describes the pathway of blood through the left side of the heart?

Accepted Answer

Pulmonary veins → left atrium → mitral valve → left ventricle → aortic semilunar valve → aorta

Question 12

Which of the following structures is responsible for electrically coupling adjacent cardiac muscle cells, allowing the heart to function as a syncytium?

Accepted Answer

Gap junctions

Question 13

Which of the following is a function of the cardiac skeleton?

Accepted Answer

It anchors cardiac muscle fibers and supports great vessels and valves.

Question 14

A patient with a blockage in the anterior interventricular artery would most likely have decreased blood supply to which region?

Accepted Answer

Interventricular septum and anterior ventricular walls

Question 15

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 16

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

Accepted Answer

They prevent backflow of blood from the major arteries into the ventricles.

Question 17

Which of the following best describes the location of the heart in the thoracic cavity?

Accepted Answer

In the mediastinum, between the second rib and fifth intercostal space, with two-thirds to the left of the midsternal line

Question 18

Which of the following is a consequence of valvular stenosis?

Accepted Answer

The heart must exert more force to pump blood through a constricted opening.

Question 19

Which of the following best explains why the heart cannot function without oxygen?

Accepted Answer

Cardiac muscle has more mitochondria and relies almost exclusively on aerobic respiration.

Anatomy & Physiology: The Cardiovascular System – The Heart (Chapter 17 Part A Study Notes)

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