Question 1

Which of the following best describes the function of the pulmonary circuit in the cardiovascular system?

Accepted Answer

It carries deoxygenated blood from the right side of the heart to the lungs for gas exchange.

Question 2

Which heart chamber has the thickest myocardium, and why?

Accepted Answer

Left ventricle, because it pumps blood to the entire body (systemic circulation).

Question 3

A patient presents with chest pain and elevated cardiac troponin I levels. What is the most likely diagnosis?

Accepted Answer

Myocardial infarction

Question 4

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

Accepted Answer

The left AV valve is also called the mitral valve.

Question 5

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

Accepted Answer

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

Question 6

Which of the following is a function of the fibrous pericardium?

Accepted Answer

It anchors the heart and prevents overstretching.

Question 7

A patient with a narrowed mitral valve is most likely to experience which of the following?

Accepted Answer

Stenosis, leading to restricted blood flow from the left atrium to the left ventricle.

Question 8

Which of the following best describes the role of the SA node?

Accepted Answer

It acts as the pacemaker, generating impulses at the fastest rate.

Question 9

Which of the following ECG findings corresponds to ventricular depolarization?

Accepted Answer

QRS complex

Question 10

A patient’s ECG shows a prolonged PR interval. What does this indicate?

Accepted Answer

Delayed conduction from atria to ventricles

Question 11

Which of the following is a risk factor for coronary artery disease (CAD)?

Accepted Answer

Obesity and lack of exercise

Question 12

Which of the following best describes the function of the chordae tendineae?

Accepted Answer

They prevent the AV valve cusps from inverting into the atria during ventricular contraction.

Question 13

Which of the following is true regarding the conduction system of the heart?

Accepted Answer

The Purkinje fibers conduct impulses to the ventricular myocardium.

Question 14

Which of the following best explains why cardiac muscle cells can contract without nerve stimulation?

Accepted Answer

They are autorhythmic and can generate their own action potentials.

Question 15

A patient with a heart rate of 120 beats per minute is experiencing which condition?

Accepted Answer

Tachycardia

Question 16

Which of the following best describes the effect of sympathetic stimulation on the heart?

Accepted Answer

Increases heart rate and force of contraction

Question 17

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

Accepted Answer

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

Question 18

Which of the following is a likely consequence of a complete blockage in a coronary artery?

Accepted Answer

Myocardial infarction

Question 19

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

Accepted Answer

It reduces friction between the heart and pericardium during heartbeats.

Question 20

Which of the following ECG findings would you expect in a patient with ventricular fibrillation?

Accepted Answer

Irregular, chaotic electrical activity with no discernible QRS complexes

The Cardiovascular System: Structure and Function of the Heart

Study Guide - Practice Questions