Question 1

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

Accepted Answer

It pumps deoxygenated blood from the right side of the heart to the lungs for gas exchange.

Question 2

A patient has a blockage in the left pulmonary artery. Which of the following would most likely be impaired as a result?

Accepted Answer

Oxygenation of blood returning from the systemic circuit

Question 3

Which structure prevents the backflow of blood from the right ventricle into the right atrium during ventricular contraction?

Accepted Answer

Tricuspid valve

Question 4

During fetal development, the foramen ovale allows blood to flow directly between which two heart chambers?

Accepted Answer

Right atrium and left atrium

Question 5

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

It must generate higher pressure to pump blood throughout the systemic circuit.

Question 6

A patient has a defect in their chordae tendineae. Which of the following complications is most likely to occur?

Accepted Answer

Backflow of blood from the ventricles into the atria during contraction

Question 7

Which of the following is a function of the pericardial fluid?

Accepted Answer

It lubricates the heart, reducing friction as the heart moves.

Question 8

Which of the following best describes the role of the atrioventricular (AV) valves?

Accepted Answer

They prevent backflow of blood from the ventricles into the atria during ventricular contraction.

Question 9

Which of the following equations correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

If a patient has an end-diastolic volume ($$EDV) of$$ $$120\,mL$$ and an end-systolic volume ($$ESV) of$$ $$50\,mL$$, what is their stroke volume ($$SV$$)?

Accepted Answer

$$SV = 120\,mL - 50\,mL = 70\,mL$$

Question 11

Which of the following statements about the fibrous pericardium is correct?

Accepted Answer

It is a tough outer layer that anchors the heart to surrounding structures.

Question 12

Which of the following best describes the function of the semilunar valves?

Accepted Answer

They prevent backflow of blood from the arteries into the ventricles.

Question 13

A patient with a failing left ventricle is likely to experience which of the following symptoms first?

Accepted Answer

Pulmonary edema due to blood backing up in the lungs

Question 14

Which of the following is the correct sequence of blood flow through the heart, starting from the systemic veins?

Accepted Answer

Superior/inferior vena cava → right atrium → right ventricle → pulmonary trunk → lungs → left atrium → left ventricle → aorta

Question 15

Which of the following best explains why the pulmonary circuit is considered a low-pressure circuit?

Accepted Answer

It pumps blood a short distance to the lungs, which requires less force.

Question 16

Which of the following statements about the myocardium is correct?

Accepted Answer

It is the thickest layer of the heart wall and contains cardiac muscle cells.

Question 17

Which of the following best describes the function of atrial natriuretic peptide (ANP) produced by the heart?

Accepted Answer

It lowers blood pressure by decreasing sodium reabsorption in the kidneys.

Question 18

Which of the following is the correct formula for ejection fraction ($$EF$$)?

Accepted Answer

$$EF = \dfrac{SV}{EDV} 	imes 100\%$$

Question 19

Which of the following best explains why the right atrium is larger and thinner-walled than the left atrium?

Accepted Answer

It receives blood from the systemic veins, which is under low pressure and larger volume.

Heart Anatomy and Physiology: Structure, Function, and Blood Flow

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