Question 1

Which of the following best describes the primary function of capillaries in the cardiovascular system?

Accepted Answer

To serve as sites for the exchange of gases, nutrients, and wastes between blood and tissues

Question 2

A patient is diagnosed with an aneurysm in an artery. Which structural feature of arteries makes them susceptible to this condition?

Accepted Answer

Their thick smooth muscle layer and high internal pressure

Question 3

Which of the following mechanisms does NOT assist in the return of blood to the heart through veins?

Accepted Answer

High arterial pressure

Question 4

During which phase of the cardiac cycle do the ventricles contract and blood is ejected into the arteries?

Accepted Answer

Ventricular systole

Question 5

Which of the following best explains why the myocardium requires its own blood supply via the coronary arteries?

Accepted Answer

The myocardium is too thick for oxygen and nutrients to diffuse directly from the blood inside the heart chambers.

Question 6

A person’s blood pressure is measured as 145/95 mm Hg. According to the classification in the study materials, which category does this fall under?

Accepted Answer

Hypertension Stage 2

Question 7

Which structure in the heart acts as the primary pacemaker, initiating the electrical impulse for each heartbeat?

Accepted Answer

Sinoatrial (SA) node

Question 8

If the left atrioventricular (mitral) valve fails to close properly, what is the most likely consequence?

Accepted Answer

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

Question 9

Which of the following best describes the role of precapillary sphincters?

Accepted Answer

They regulate the amount of blood entering individual capillaries by contracting or relaxing.

Question 10

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

Accepted Answer

SA node → AV node → AV bundle → Purkinje fibers

Question 11

A patient has a blockage in the pulmonary artery. Which of the following is the most immediate effect?

Accepted Answer

Decreased oxygenation of blood in the lungs

Question 12

Which of the following statements about the lymphatic system is correct?

Accepted Answer

It returns excess interstitial fluid, lipids, and large substances to the bloodstream, helping maintain blood volume.

Question 13

Which heart sound is associated with the closure of the semilunar valves?

Accepted Answer

"dup"

Question 14

Which of the following best explains why veins have thinner walls and larger lumens compared to arteries?

Accepted Answer

Veins carry blood under lower pressure and need to accommodate larger volumes of blood.

Question 15

A person stands for long periods without moving. Which condition are they most at risk for developing and why?

Accepted Answer

Varicose veins, due to pooling of blood and increased pressure in the veins of the legs

Question 16

Which of the following equations correctly represents the calculation of blood pressure?

Accepted Answer

$$	ext{Blood Pressure} = \frac{	ext{Force}}{	ext{Area}}$$

Question 17

Which part of an ECG corresponds to the depolarization of the ventricles?

Accepted Answer

QRS complex

Question 18

If the Purkinje fibers are damaged, which of the following is most likely to occur?

Accepted Answer

The ventricles will contract in a disorganized and inefficient manner.

Question 19

Which of the following best describes the function of the chordae tendineae?

Accepted Answer

They anchor the AV valves to the papillary muscles, preventing valve prolapse during ventricular contraction.

Question 20

A patient’s ECG shows irregular, rapid, and uncoordinated ventricular contractions. What is the most likely diagnosis?

Accepted Answer

Ventricular fibrillation

The Cardiovascular System: Structure, Function, and Regulation

Study Guide - Practice Questions