Question 1

Which structure is responsible for initiating the electrical impulse that regulates the heart's rhythm?

Accepted Answer

SA node

Question 2

What is the primary function of the pericardium?

Accepted Answer

To protect the heart and reduce friction during contractions

Question 3

Which heart chamber has the thickest wall, and why?

Accepted Answer

Left ventricle, because it pumps blood to the entire body

Question 4

What is the correct pathway of blood through the heart, starting with the vena cava?

Accepted Answer

Vena cava → Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle → Aorta

Question 5

Which equation best represents cardiac output?

Accepted Answer

$$CO = HR 	imes SV$$

Question 6

A patient presents with high blood pressure. Which condition is most likely present?

Accepted Answer

Hypertension

Question 7

How do statins help treat atherosclerosis?

Accepted Answer

By lowering LDL cholesterol levels in the blood

Question 8

Which of the following is a plausible consequence of untreated hypertension?

Accepted Answer

Increased risk of heart failure

Question 9

Which valve prevents backflow of blood from the right ventricle to the right atrium?

Accepted Answer

Tricuspid valve

Question 10

Which arrhythmia is generally considered fatal without immediate intervention?

Accepted Answer

Ventricular fibrillation

Question 11

What is the main role of the endocardium?

Accepted Answer

To line the inner chambers of the heart and prevent blood clots

Question 12

Which of the following best describes the function of the myocardium?

Accepted Answer

It is the muscular layer responsible for heart contractions

Question 13

If the left ventricle fails to pump efficiently, which of the following is a likely consequence?

Accepted Answer

Pulmonary congestion and edema

Question 14

Which of the following is a direct effect of atherosclerosis on the cardiovascular system?

Accepted Answer

Decreased arterial elasticity

Question 15

How does the brain monitor blood pressure?

Accepted Answer

Through baroreceptors in the carotid arteries and aorta

Question 16

Which of the following is NOT a component of cardiac output?

Accepted Answer

Blood pressure

Question 17

A patient with a blocked bicuspid (mitral) valve would most likely experience which symptom?

Accepted Answer

Reduced blood flow from the left atrium to the left ventricle

Question 18

Which formula correctly relates blood pressure, cardiac output, and peripheral resistance?

Accepted Answer

$$BP = CO 	imes PR$$

Question 19

Which of the following is a common misconception about hypertension?

Accepted Answer

It only affects elderly individuals

Question 20

Which of the following best describes the role of the tricuspid valve?

Accepted Answer

It prevents backflow from the right ventricle to the right atrium

Cardiovascular System: Structure, Function, and Pathology

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