Question 1

Which of the following best describes the function of the pulmonary circuit in the cardiovascular system?

Accepted Answer

It transports blood from the heart to the lungs for oxygenation and removal of carbon dioxide.

Question 2

A patient is diagnosed with a transposition of the great vessels, where the aorta and pulmonary trunk are switched. What is the most likely physiological consequence of this defect?

Accepted Answer

Blood leaving the right ventricle would never reach the lungs, and blood leaving the left ventricle would travel to the lungs.

Question 3

Which layer of the heart wall is responsible for the contractile force that pumps blood throughout the body?

Accepted Answer

Myocardium

Question 4

The serous membranes that surround the heart and secrete serous fluid are the:

Accepted Answer

Epicardium and parietal pericardium

Question 5

During ventricular contraction, which structure prevents the atrioventricular valves from inverting into the atria?

Accepted Answer

Chordae tendineae

Question 6

If the chordae tendineae attached to the bicuspid (mitral) valve are too long, what is the most likely result when the left ventricle contracts?

Accepted Answer

Blood will be able to leak back into the left atrium.

Question 7

Which type of tissue makes up the tunica media of blood vessels, allowing them to constrict and dilate?

Accepted Answer

Smooth muscle

Question 8

Which of the following is a unique feature of veins that helps maintain blood flow toward the heart under low pressure?

Accepted Answer

Valves formed from the tunica intima

Question 9

Which type of capillary is most likely to be found in the bone marrow and spleen, allowing the passage of large molecules and cells?

Accepted Answer

Sinusoidal capillary

Question 10

A patient with Celiac Disease develops anemia. What is the most likely explanation for this symptom?

Accepted Answer

Nutritional deficits of vitamins such as B12 and folate can prevent the formation of enough mature red blood cells.

Question 11

Which of the following best describes the function of the fibrous skeleton of the heart?

Accepted Answer

It acts as a barrier preventing electrical impulses from passing directly from the atria to the ventricles.

Question 12

Which of the following statements about erythrocytes is correct?

Accepted Answer

They are anucleate and rely on glycolysis for energy.

Question 13

A person with type A+ blood is exposed to type AB- blood. Which antibodies would they produce?

Accepted Answer

Anti-B

Question 14

Which of the following best explains why arteries have thicker walls than veins?

Accepted Answer

Arteries are under higher pressure than veins.

Question 15

Which of the following is a function of albumin found in blood plasma?

Accepted Answer

Binding and transporting solutes such as hormones and nutrients

Question 16

Which of the following best describes the role of gap junctions in cardiac muscle tissue?

Accepted Answer

They allow for rapid communication between cells for coordinated contraction.

Question 17

Which of the following is true regarding the cardiac cycle?

Accepted Answer

Systole refers to contraction and diastole refers to relaxation.

Question 18

Which of the following is a real-world consequence of atherosclerosis?

Accepted Answer

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

Question 19

Which of the following best describes the function of precapillary sphincters in capillary beds?

Accepted Answer

They regulate blood flow into true capillaries.

Question 20

Which of the following statements about the hepatic portal system is correct?

Accepted Answer

It allows blood to pass through a second capillary bed in the liver before returning to the heart.

The Cardiovascular System: Structure, Function, and Blood Flow

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