Question 1

Which of the following best describes the function of the pericardium surrounding the heart?

Accepted Answer

It provides a protective sac that reduces friction as the heart beats.

Question 2

A patient is diagnosed with a blockage in the tricuspid valve. Which of the following best describes the immediate effect on blood flow?

Accepted Answer

Blood flow from the right atrium to the right ventricle is impeded.

Question 3

Which heart chamber has the thickest wall, and what is the physiological reason for this?

Accepted Answer

Left ventricle, because it must generate enough pressure to pump blood throughout the systemic circulation.

Question 4

Which of the following equations correctly represents cardiac output?

Accepted Answer

$CO = HR 	imes SV$

Question 5

A patient’s ECG shows an absence of P waves but a normal QRS complex and T wave. Which part of the heart’s conduction system is most likely not functioning properly?

Accepted Answer

SA node

Question 6

Which of the following best explains how the brain monitors and responds to changes in blood pressure?

Accepted Answer

Baroreceptors in the aorta and carotid arteries send signals to the medulla oblongata, which adjusts heart rate and vessel diameter.

Question 7

A patient with chronic hypertension is at increased risk for which of the following conditions due to the effects of high blood pressure on arterial walls?

Accepted Answer

Atherosclerosis

Question 8

Which of the following best describes the mechanism by which statins treat atherosclerosis?

Accepted Answer

They inhibit cholesterol synthesis in the liver, reducing plaque formation.

Question 9

If the left ventricle fails to pump effectively, which of the following is the most likely immediate consequence?

Accepted Answer

Blood backs up into the pulmonary circulation, leading to pulmonary edema.

Question 10

Which of the following arrhythmias is generally considered fatal without immediate intervention?

Accepted Answer

Ventricular fibrillation

Question 11

Which of the following best describes the pathway of blood through the heart, starting with the vena cava?

Accepted Answer

Vena cava → right atrium → tricuspid valve → right ventricle → pulmonary valve → pulmonary artery → lungs → pulmonary veins → left atrium → bicuspid (mitral) valve → left ventricle → aortic valve → aorta

Question 12

Which of the following best explains how heart valves regulate the flow of blood between chambers?

Accepted Answer

They open and close in response to pressure differences, preventing backflow.

Question 13

A patient with a defective bicuspid (mitral) valve is most likely to experience which of the following?

Accepted Answer

Backflow of blood from the left ventricle to the left atrium during ventricular contraction.

Question 14

Which of the following is a direct component of cardiac output?

Accepted Answer

Stroke volume

Question 15

Which of the following best describes hypertension?

Accepted Answer

A chronic condition characterized by persistently elevated arterial blood pressure.

Question 16

A patient is prescribed a beta-blocker for hypertension. What is the primary mechanism by which this medication lowers blood pressure?

Accepted Answer

It decreases heart rate and contractility, reducing cardiac output.

Question 17

Which of the following is a common consequence of untreated atherosclerosis?

Accepted Answer

Increased risk of myocardial infarction (heart attack)

Question 18

Which of the following best describes the role of the SA node in cardiac physiology?

Accepted Answer

It acts as the primary pacemaker, initiating electrical impulses that set the heart rate.

Question 19

A patient with a heart rate of 80 beats per minute and a stroke volume of 70 mL/beat has a cardiac output of:

Accepted Answer

$CO = 80 	imes 70 = 5600\ 	ext{mL/min}$

Question 20

Which of the following best explains why ventricular fibrillation is life-threatening?

Accepted Answer

The ventricles quiver instead of contracting, so no effective blood is pumped to the body or lungs.

Cardiovascular System: Structure, Function, and Pathology

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