Question 1

Which of the following best describes the primary function of the heart?

Accepted Answer

To pump blood throughout the body, delivering oxygen and nutrients while removing waste products

Question 2

Where is the human heart located within the thoracic cavity?

Accepted Answer

In the mediastinum, between the lungs and slightly left of the midline

Question 3

Which layer of the pericardium is directly attached to the heart muscle?

Accepted Answer

Visceral pericardium (epicardium)

Question 4

Which of the following correctly lists the layers of the heart wall from outermost to innermost?

Accepted Answer

Epicardium, myocardium, endocardium

Question 5

Which structure prevents the backflow of blood from the right ventricle to the right atrium during ventricular contraction?

Accepted Answer

Tricuspid (right atrioventricular) valve

Question 6

What is the main anatomical difference between atrioventricular (A-V) valves and semilunar valves?

Accepted Answer

A-V valves are located between the atria and ventricles and have chordae tendineae; semilunar valves are located at the exits of the ventricles and lack chordae tendineae.

Question 7

Which of the following best describes the pulmonary circuit?

Accepted Answer

It carries deoxygenated blood from the right ventricle to the lungs and returns oxygenated blood to the left atrium.

Question 8

A patient has a blockage in the left coronary artery. Which area of the heart is most likely to be affected?

Accepted Answer

The left atrium and left ventricle

Question 9

Which of the following best describes the function of papillary muscles and chordae tendineae?

Accepted Answer

They prevent the atrioventricular valves from inverting into the atria during ventricular contraction.

Question 10

Which of the following is the correct sequence of electrical conduction through the heart?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 11

During which phase of the cardiac cycle does ventricular filling occur?

Accepted Answer

Diastole

Question 12

Which heart sound is associated with the closure of the atrioventricular (A-V) valves?

Accepted Answer

The first heart sound (S1), 'lub'

Question 13

Which formula correctly represents cardiac output?

Accepted Answer

$$CO = HR 	imes SV$$

Question 14

A patient presents with a rapid, irregular heartbeat and an ECG showing no distinct P waves. What is the most likely diagnosis?

Accepted Answer

Atrial fibrillation

Question 15

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

Accepted Answer

The greater the preload (stretch of the ventricular wall), the greater the force of contraction.

Question 16

Which of the following is a likely consequence of multiple premature ventricular contractions (PVCs) and ventricular tachycardia (VT)?

Accepted Answer

Increased risk of sudden cardiac arrest

Question 17

Which of the following is a function of the intrinsic conducting system of the heart?

Accepted Answer

To coordinate the timing of cardiac muscle contraction

Question 18

Which of the following best describes the effect of sympathetic nervous system stimulation on the heart?

Accepted Answer

It increases heart rate and contractility.

Question 19

A patient is diagnosed with valve insufficiency. Which of the following best describes this condition?

Accepted Answer

A valve does not close properly, allowing blood to leak backward.

Question 20

Which of the following best describes the difference between intrinsic and extrinsic controls of the heart?

Accepted Answer

Intrinsic controls originate within the heart itself, while extrinsic controls involve neural and hormonal influences from outside the heart.

Chapter 17: The Cardiovascular System I – The Heart (Study Guide)

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