Question 1

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

Accepted Answer

It is located in the mediastinum, between the lungs, with the base superior and apex pointing inferiorly to the left.

Question 2

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

Accepted Answer

Myocardium

Question 3

A patient presents with inflammation of the pericardium. Which of the following best describes the structure affected?

Accepted Answer

The double-walled sac surrounding the heart, consisting of fibrous and serous layers

Question 4

Which of the following correctly traces the pathway of blood through the right side of the heart to the lungs?

Accepted Answer

Right atrium → tricuspid valve → right ventricle → pulmonary semilunar valve → pulmonary trunk → pulmonary arteries

Question 5

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

Accepted Answer

Mitral (bicuspid) valve

Question 6

A blockage in which coronary artery branch is most likely to cause an anterior myocardial infarction?

Accepted Answer

Anterior interventricular branch (left anterior descending)

Question 7

Which of the following statements about the conduction system of the heart is correct?

Accepted Answer

The Purkinje fibers distribute excitation through the ventricular myocardium.

Question 8

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

Accepted Answer

It pumps blood to the entire systemic circuit, requiring greater pressure.

Question 9

Which of the following is a function of the chordae tendineae in the heart?

Accepted Answer

They anchor the AV valve flaps to papillary muscles, preventing valve prolapse during ventricular contraction.

Question 10

A newborn is diagnosed with a patent foramen ovale. What is the physiological consequence of this condition?

Accepted Answer

Blood can flow directly from the right atrium to the left atrium, allowing deoxygenated blood to bypass the pulmonary circuit.

Question 11

Which of the following best describes the role of the coronary sinus?

Accepted Answer

It collects deoxygenated blood from the myocardium and returns it to the right atrium.

Question 12

Which of the following is true regarding the autonomic regulation of the heart?

Accepted Answer

The sympathetic division increases heart rate and force of contraction.

Question 13

Which of the following is a real-life consequence of coronary atherosclerosis?

Accepted Answer

Myocardial infarction due to blockage of blood flow to heart tissue

Question 14

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

Accepted Answer

They allow rapid electrical communication between cardiocytes, enabling coordinated contraction.

Question 15

During ventricular contraction, which valves are open and which are closed?

Accepted Answer

Atrioventricular valves are closed; semilunar valves are open.

Question 16

Which of the following is the correct sequence of structures that an electrical impulse travels through the heart's conduction system?

Accepted Answer

SA node → AV node → AV bundle → bundle branches → Purkinje fibers

Question 17

Which of the following best explains why the fossa ovalis is present in the adult heart?

Accepted Answer

It is a remnant of the foramen ovale, which allowed fetal blood to bypass the pulmonary circuit.

Question 18

A patient has a congenital defect resulting in a missing interventricular septum. Which of the following is a likely consequence?

Accepted Answer

Mixing of oxygenated and deoxygenated blood between the left and right ventricles

Question 19

Which of the following best describes the function of the papillary muscles?

Accepted Answer

They contract to prevent prolapse of the AV valves by pulling on the chordae tendineae.

Question 20

Which of the following is a direct result of the closure of the ductus arteriosus after birth?

Accepted Answer

Blood flows from the right ventricle to the lungs for oxygenation.

The Heart: Structure, Function, and Circulation

Study Guide - Practice Questions