Question 1

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

Accepted Answer

Myocardium

Question 2

During the cardiac cycle, which event directly follows ventricular depolarization?

Accepted Answer

Ventricular contraction (systole)

Question 3

The apex of the heart is oriented toward which anatomical direction in the human body?

Accepted Answer

Inferior and left

Question 4

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

Accepted Answer

They allow ions to pass directly between cells, enabling synchronized contraction.

Question 5

Which structure initiates the intrinsic conduction system of the heart?

Accepted Answer

Sinoatrial (SA) node

Question 6

A patient suffers a myocardial infarction affecting the left ventricle. Which layer of the heart wall is most likely to be damaged?

Accepted Answer

Myocardium

Question 7

Which of the following equations correctly calculates stroke volume ($SV$) from end-diastolic volume ($EDV$) and end-systolic volume ($ESV$)?

Accepted Answer

$SV = EDV - ESV$

Question 8

Which heart valve prevents backflow of blood from the left ventricle into the left atrium?

Accepted Answer

Mitral (bicuspid) valve

Question 9

Where are the cardioinhibitory and cardioacceleratory centers that regulate heart rate located?

Accepted Answer

Medulla oblongata

Question 10

Which of the following best describes the role of desmosomes in cardiac muscle tissue?

Accepted Answer

They anchor adjacent cells together, providing mechanical strength during contraction.

Question 11

A blockage in the right coronary artery would most directly affect which part of the heart's conduction system?

Accepted Answer

Sinoatrial (SA) node

Question 12

Which of the following is the correct sequence of blood flow through the heart, starting from the vena cava?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta

Question 13

Which of the following best explains why the action potential in cardiac muscle cells has a plateau phase?

Accepted Answer

Sustained influx of calcium ions

Question 14

Which covering of the heart is directly attached to the surface of the heart muscle?

Accepted Answer

Visceral pericardium (epicardium)

Question 15

If a patient’s $EDV$ is 120 mL and $ESV$ is 50 mL, what is their stroke volume ($SV$)?

Accepted Answer

$SV = 70 	ext{ mL}$

Question 16

Which of the following is NOT a function of the pericardium?

Accepted Answer

Generating the contractile force for blood ejection

Question 17

Which phase of the cardiac cycle is associated with the closure of the AV valves and the opening of the semilunar valves?

Accepted Answer

Ventricular systole

Question 18

Which cell junction is most critical for the rapid transmission of electrical impulses in cardiac muscle?

Accepted Answer

Gap junctions

Question 19

Which of the following best describes the location of the heart within the body cavity?

Accepted Answer

Within the mediastinum

Question 20

Which of the following is a direct result of the autonomic innervation of the heart?

Accepted Answer

Regulation of heart rate and force of contraction

Cardiac Anatomy and Physiology: Study Guide

Study Guide - Practice Questions