Question 1

Which layer of the heart wall is responsible for the contractile force that pumps blood throughout the body?

Accepted Answer

Myocardium

Question 2

A patient presents with chest pain and a 'friction rub' sound on auscultation. Which condition is most likely responsible for these symptoms?

Accepted Answer

Pericarditis

Question 3

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

Accepted Answer

They anchor the cusps of the atrioventricular valves to the papillary muscles.

Question 4

During which phase of the cardiac cycle are the semilunar valves open?

Accepted Answer

Ventricular systole

Question 5

Which equation correctly represents the calculation of stroke volume (SV)?

Accepted Answer

$$SV = EDV - ESV$$

Question 6

A blockage in the left coronary artery would most directly affect which region of the heart?

Accepted Answer

Left ventricle

Question 7

Which structure is known as the pacemaker of the heart?

Accepted Answer

Sinoatrial (SA) node

Question 8

If the AV node is damaged, what is the most likely immediate effect on the heart's electrical conduction?

Accepted Answer

The ventricles will contract at a slower, intrinsic rate.

Question 9

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

Accepted Answer

It pumps blood into the systemic circuit, which has higher resistance.

Question 10

A patient with a defective mitral (bicuspid) valve is most likely to experience which of the following?

Accepted Answer

Backflow of blood into the left atrium during ventricular contraction

Question 11

Which of the following is a direct effect of sympathetic nervous system activation on the heart?

Accepted Answer

Increased contractility and heart rate

Question 12

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the end-diastolic volume, the greater the force of contraction.

Question 13

A patient is diagnosed with cardiac tamponade. Which of the following best describes the physiological consequence?

Accepted Answer

Compression of the heart due to excess fluid in the pericardial cavity

Question 14

Which of the following ions is primarily responsible for the plateau phase of the cardiac muscle action potential?

Accepted Answer

Calcium (Ca2+)

Question 15

Which of the following best describes the function of gap junctions in cardiac muscle?

Accepted Answer

They allow ions to pass between cells, enabling coordinated contraction.

Question 16

A patient with persistent tachycardia is at risk for which of the following complications?

Accepted Answer

Decreased ventricular filling and reduced cardiac output

Question 17

Which of the following equations correctly represents cardiac output (CO)?

Accepted Answer

$$CO = SV 	imes HR$$

Question 18

A patient with a septal defect is most likely to experience which of the following?

Accepted Answer

Mixing of oxygen-rich and oxygen-poor blood

Question 19

Which of the following best explains why myocardial infarction leads to decreased contractile function in the affected region?

Accepted Answer

Scar tissue replaces dead cardiac muscle cells, which cannot contract.

Question 20

Which of the following would most likely result from a sudden increase in afterload?

Accepted Answer

Decreased stroke volume (SV)

Chapter 18: The Cardiovascular System – The Heart

Study Guide - Practice Questions