$$CO = Stroke\ Volume \times Heart\ Rate$$

Question 1

Which of the following best describes the function of the pulmonary circuit in the heart?

Accepted Answer

It receives oxygen-poor blood from the body and pumps it to the lungs for oxygenation.

Question 2

A patient presents with a heart murmur best heard at the apex of the heart. Which valve is most likely affected?

Accepted Answer

Mitral (bicuspid) valve

Question 3

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

Accepted Answer

Myocardium

Question 4

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

Accepted Answer

Atrioventricular valves are closed; semilunar valves are open.

Question 5

Which structure prevents the atrioventricular valve flaps from everting into the atria during ventricular contraction?

Accepted Answer

Chordae tendineae and papillary muscles

Question 6

A blockage in the left anterior descending artery (LAD) would most directly affect which region of the heart?

Accepted Answer

Anterior wall of the left ventricle and interventricular septum

Question 7

Which of the following is NOT a function of the cardiac skeleton?

Accepted Answer

Conducting electrical impulses between atria and ventricles

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 through the systemic circuit, which offers greater resistance.

Question 9

Which of the following is the correct sequence of the heart’s intrinsic conduction system?

Accepted Answer

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

Question 10

A patient with atrial fibrillation is at increased risk for which of the following complications?

Accepted Answer

Stroke due to clot formation in the atria

Question 11

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

Accepted Answer

$$CO = Stroke\ Volume 	imes Heart\ Rate$$

Question 12

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

Accepted Answer

They allow rapid transmission of electrical impulses between cardiac cells.

Question 13

Which nerve is primarily responsible for decreasing heart rate via parasympathetic innervation?

Accepted Answer

Vagus nerve

Question 14

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

Accepted Answer

Mixing of oxygen-rich and oxygen-poor blood between the ventricles

Question 15

Which of the following statements about the pericardium is correct?

Accepted Answer

The visceral layer of the serous pericardium is also called the epicardium.

Question 16

Which of the following best explains why regular aerobic exercise benefits the heart in old age?

Accepted Answer

It increases the strength of the heart and helps clear fatty deposits in coronary arteries.

Question 17

Which of the following is a direct result of sympathetic stimulation of the heart?

Accepted Answer

Increased heart rate and strength of contraction

Question 18

Which of the following is the main vein that returns deoxygenated blood from the heart wall to the right atrium?

Accepted Answer

Coronary sinus

Question 19

Which of the following best describes the sequence of blood flow through the heart, starting with the right atrium?

Accepted Answer

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

Question 20

Which of the following is a common cause of cardiac arrest due to rapid, random firing of electrical impulses in the ventricles?

Accepted Answer

Ventricular fibrillation

The Heart: Structure, Function, and Clinical Correlates

Study Guide - Practice Questions