Q: Which of the following equations correctly represents cardiac output ($$CO$$), and what does it measure?

$$CO = HR \times SV$$; it measures the volume of blood pumped by each ventricle per minute.

Question 1

Which layer of the heart is being pointed to in the first image, and what is its primary function?

Accepted Answer

Parietal pericardium; it forms the outermost protective sac around the heart, reducing friction during heartbeats.

Question 2

A patient suffers a stab wound that penetrates the outermost layer seen in the second image. Which of the following complications is most likely to occur?

Accepted Answer

Pericardial effusion, leading to cardiac tamponade.

Question 3

In the third image, which vessel is responsible for carrying oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Question 4

Which structure, visible in the fourth image, is responsible for separating the right and left ventricles externally?

Accepted Answer

Posterior interventricular sulcus

Question 5

A blockage in the vessel shown branching off the aortic arch in the fifth image would most directly affect blood flow to which region?

Accepted Answer

Right arm and right side of the head

Question 6

Which heart valve, visible in the sixth image, prevents backflow of blood from the left ventricle into the left atrium?

Accepted Answer

Bicuspid (mitral) valve

Question 7

If the structure indicated by the probe in the seventh image fails to function properly, which of the following symptoms is most likely?

Accepted Answer

Pulmonary edema due to left-sided heart failure

Question 8

Which of the following best describes the flow of blood through the heart, starting at the right atrium?

Accepted Answer

Right atrium → tricuspid valve → right ventricle → pulmonary semilunar valve → pulmonary artery → lungs → left atrium → bicuspid valve → left ventricle → aortic semilunar valve → aorta

Question 9

A clot in the coronary sinus, as seen in the eighth image, would most directly impair which function?

Accepted Answer

Drainage of deoxygenated blood from the heart muscle

Question 10

Which of the following equations correctly represents cardiac output ($$CO$$), and what does it measure?

Accepted Answer

$$CO = HR 	imes SV$$; it measures the volume of blood pumped by each ventricle per minute.

Question 11

During vigorous exercise, which chamber of the heart (as seen in the cross-section images) would show the greatest increase in wall thickness over time?

Accepted Answer

Left ventricle

Question 12

Which structure, visible in the anatomical models, is a remnant of fetal circulation and connects the pulmonary trunk to the aorta?

Accepted Answer

Ligamentum arteriosum

Question 13

If the aortic semilunar valve (as seen in the internal heart images) becomes stenotic, what is the most likely physiological consequence?

Accepted Answer

Decreased blood flow from the left ventricle to the aorta

Question 14

Which of the following best describes the function of the chordae tendineae, as seen in the dissected heart images?

Accepted Answer

They prevent the atrioventricular valves from inverting during ventricular contraction.

Question 15

A patient with a congenital defect in the bicuspid (mitral) valve is most likely to experience which of the following symptoms?

Accepted Answer

Backflow of blood into the left atrium during ventricular contraction

Question 16

Which of the following arteries, visible on the anterior surface of the heart model, supplies blood to the interventricular septum and anterior walls of both ventricles?

Accepted Answer

Anterior interventricular artery (left anterior descending)

Question 17

If the pulmonary semilunar valve fails to close properly, what is the most likely immediate effect on the heart's function?

Accepted Answer

Blood will flow back into the right ventricle from the pulmonary artery during diastole.

Question 18

Which of the following best describes the role of the coronary arteries, as seen in the heart models?

Accepted Answer

They supply oxygenated blood to the heart muscle itself.

Question 19

Which of the following equations correctly represents the relationship between blood pressure ($$BP$$), cardiac output ($$CO$$), and total peripheral resistance ($$TPR$$)?

Accepted Answer

$$BP = CO 	imes TPR$$

Question 20

A patient with a blockage in the left pulmonary artery would experience which of the following?

Accepted Answer

Reduced blood flow to the left lung, leading to decreased oxygenation of blood returning to the left atrium.

Anatomy of the Heart: Structure, Circuits, and Internal Features (A&P II: Lab 3 Review)

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