Question 1

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

Accepted Answer

It is the space between the lungs, extending from the sternum to the vertebral column and from the thoracic inlet to the diaphragm.

Question 2

Which organ is NOT found within the mediastinum?

Accepted Answer

Liver

Question 3

The pericardial sac consists of which two main layers?

Accepted Answer

Fibrous pericardium and serous pericardium

Question 4

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

Accepted Answer

Myocardium

Question 5

A patient presents with pericardial effusion. Which of the following symptoms is most likely due to the accumulation of fluid in the pericardial sac?

Accepted Answer

Reduced cardiac output leading to shortness of breath and fatigue

Question 6

Which of the following correctly matches a heart chamber with its associated valve?

Accepted Answer

Right atrium - Tricuspid valve

Question 7

During the cardiac cycle, which valve prevents backflow of blood from the left ventricle to the left atrium?

Accepted Answer

Mitral (bicuspid) valve

Question 8

Which of the following best describes the path of blood flow through the heart and lungs?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → pulmonary veins → left atrium → left ventricle → aorta

Question 9

Which equation best represents cardiac output ($CO$) in terms of stroke volume ($SV$) and heart rate ($HR$)?

Accepted Answer

$CO = SV 	imes HR$

Question 10

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

Accepted Answer

Left ventricle and interventricular septum

Question 11

Which of the following statements about the systemic and pulmonary circuits is correct?

Accepted Answer

The pulmonary circuit carries deoxygenated blood from the right ventricle to the lungs and returns oxygenated blood to the left atrium.

Question 12

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

Accepted Answer

It anchors the heart within the chest cavity and prevents overfilling.

Question 13

A patient undergoes pericardiocentesis. What is the primary purpose of this procedure?

Accepted Answer

To remove excess fluid from the pericardial sac and relieve pressure on the heart

Question 14

Which of the following best describes the function of the semilunar valves?

Accepted Answer

They prevent backflow of blood from the arteries into the ventricles during ventricular relaxation.

Question 15

Which of the following is a consequence of pericardial effusion if left untreated?

Accepted Answer

Cardiac tamponade, leading to impaired ventricular filling and reduced cardiac output

Question 16

Which of the following structures is NOT part of the coronary circulation?

Accepted Answer

Pulmonary veins

Question 17

Which layer of the serous pericardium is in direct contact with the heart muscle?

Accepted Answer

Visceral layer (epicardium)

Question 18

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

Accepted Answer

It must generate higher pressure to pump blood through the systemic circuit.

Question 19

Which of the following is the correct sequence of heart wall layers from outermost to innermost?

Accepted Answer

Epicardium → Myocardium → Endocardium

Question 20

A patient with a defect in the tricuspid valve would most likely experience abnormal blood flow between which two chambers?

Accepted Answer

Right atrium and right ventricle

Anatomy & Physiology: Cardiovascular System I – The Heart

Study Guide - Practice Questions