Question 1

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

Accepted Answer

The left ventricle, because it must pump blood to the entire body against high resistance.

Question 2

Which of the following best describes the pathway of blood through the heart, starting from 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 3

Cardiac output ($$CO) is a $$critical measure of heart function. Which formula correctly calculates cardiac output?

Accepted Answer

$$CO = HR 	imes SV$$

Question 4

A patient’s ECG shows a missing P wave but a normal QRS complex and T wave. What does this most likely indicate?

Accepted Answer

The sinoatrial (SA) node is not functioning properly, and the atria are not depolarizing.

Question 5

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

Accepted Answer

Ventricular fibrillation

Question 6

How do heart valves regulate the flow of blood between chambers?

Accepted Answer

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

Question 7

Which of the following best describes how the brain monitors blood pressure?

Accepted Answer

Baroreceptors in the carotid sinus and aortic arch send signals to the medulla oblongata.

Question 8

Atherosclerosis is a major risk factor for cardiovascular disease. What is the primary mechanism by which statins help treat atherosclerosis?

Accepted Answer

Statins inhibit HMG-CoA reductase, reducing cholesterol synthesis in the liver.

Question 9

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

Accepted Answer

Increased risk of damage to blood vessel walls, leading to atherosclerosis.

Question 10

Which structure is responsible for initiating the electrical impulse that regulates the heart’s own beating?

Accepted Answer

Sinoatrial (SA) node

Question 11

A patient has a cardiac output of $$5\,L/min$$ and a heart rate of $$100\,beats/min. $$What is the stroke volume ($$SV$$)?

Accepted Answer

$$SV = \frac{CO}{HR} = \frac{5\,L/min}{100\,beats/min} = 0.05\,L = 50\,mL$$

Question 12

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

Accepted Answer

Blood pressure

Question 13

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

Accepted Answer

Tricuspid valve

Question 14

Which of the following best explains why the left ventricle must generate higher pressure than the right ventricle?

Accepted Answer

It pumps blood into the systemic circulation, which has higher resistance than the pulmonary circulation.

Question 15

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

Accepted Answer

Left ventricular hypertrophy

Question 16

Which of the following best describes the role of the pericardium?

Accepted Answer

It protects the heart and reduces friction during contraction.

Question 17

A patient is diagnosed with atherosclerosis. Which of the following is most likely to occur as a result?

Accepted Answer

Narrowing of arteries due to plaque buildup, increasing risk of heart attack.

Question 18

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

Accepted Answer

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

Question 19

Which of the following is a primary function of the endocardium?

Accepted Answer

It provides a smooth lining for the heart chambers, reducing friction and preventing clot formation.

Question 20

A patient with atrial fibrillation is at increased risk for which complication?

Accepted Answer

Stroke due to formation of blood clots in the atria.

Cardiovascular System: Structure, Function, and Pathology

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