Question 1

Which of the following best describes the location of the heart within the thorax?

Accepted Answer

The heart is located in the mediastinum, between the lungs and behind the sternum.

Question 2

What is the primary function of the pericardium?

Accepted Answer

To protect the heart and anchor it within the thorax.

Question 3

Pericarditis is most commonly caused by which of the following?

Accepted Answer

Viral infection leading to inflammation of the pericardium.

Question 4

Which layer of the heart wall is responsible for contraction and pumping blood?

Accepted Answer

Myocardium

Question 5

Intercalated discs in cardiac muscle tissue serve which primary function?

Accepted Answer

Facilitate rapid electrical communication between cardiac cells.

Question 6

Cardiac hypertrophy is best defined as:

Accepted Answer

An increase in the size of the heart muscle cells due to chronic pressure overload.

Question 7

Which sequence correctly describes the flow of blood through the heart?

Accepted Answer

Right atrium → right ventricle → lungs → left atrium → left ventricle → body

Question 8

The S1 heart sound is primarily caused by:

Accepted Answer

Closure of the atrioventricular (AV) valves.

Question 9

Mitral valve prolapse (MVP) is characterized by:

Accepted Answer

Improper closure of the mitral valve, causing blood to leak backward into the left atrium.

Question 10

Coronary artery disease (CAD) is best described as:

Accepted Answer

A narrowing of the coronary arteries due to atherosclerosis, reducing blood flow to the heart muscle.

Question 11

Which blood test is most specific for diagnosing myocardial infarction (MI)?

Accepted Answer

Troponin levels

Question 12

The conduction pathway of the heart begins at which structure?

Accepted Answer

Sinoatrial (SA) node

Question 13

During the QRS complex of an ECG, which event occurs?

Accepted Answer

Ventricular depolarization

Question 14

Why are slow calcium channels important in cardiac muscle compared to skeletal muscle?

Accepted Answer

They prolong the action potential, allowing for sustained contraction and preventing tetany.

Question 15

ST elevation on an ECG is most indicative of:

Accepted Answer

Acute myocardial infarction (MI)

Question 16

Which equation correctly represents cardiac output (CO)?

Accepted Answer

$$ CO = HR 	imes SV $$

Question 17

If a patient has a stroke volume (SV) of 70 mL and a heart rate (HR) of 75 bpm, what is their cardiac output (CO)?

Accepted Answer

$$ CO = 70 	imes 75 = 5250 	ext{ mL/min} $$

Question 18

Ejection fraction (EF) is calculated using which formula?

Accepted Answer

$$ EF = \frac{SV}{EDV} 	imes 100\% $$

Question 19

A patient has an end-diastolic volume (EDV) of 120 mL and a stroke volume (SV) of 60 mL. What is their ejection fraction (EF)?

Accepted Answer

$$ EF = \frac{60}{120} 	imes 100\% = 50\% $$

Question 20

Which hormone is released by the heart in response to increased blood volume and acts to reduce blood pressure?

Accepted Answer

Atrial natriuretic peptide (ANP)

Study Guide: The Heart (Chapter 20) – Structure, Function, and Clinical Aspects

Study Guide - Practice Questions