Question 1

Which of the following veins is responsible for conducting deoxygenated blood into the right atrium of the heart?

Accepted Answer

Superior vena cava

Question 2

What is the primary function of the papillary muscles within the heart?

Accepted Answer

To prevent the inversion of the AV valve flaps during ventricular contraction

Question 3

Why are valves necessary in the heart, and how do they function?

Accepted Answer

Valves prevent backflow of blood by opening and closing in response to pressure changes

Question 4

Which structures are composed of collagen and are attached to the AV valve flaps to prevent prolapse during ventricular contraction?

Accepted Answer

Chordae tendineae

Question 5

Trace the flow of blood through the heart, starting from the vena cava and ending at the aorta. Which of the following correctly lists the sequence?

Accepted Answer

Vena cava → right atrium → right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium → left ventricle → aorta

Question 6

Why is the left ventricle wall significantly thicker than the right ventricle wall?

Accepted Answer

Because the left ventricle pumps blood to the entire body, requiring higher pressure

Question 7

A patient has a malfunction in the chordae tendineae. What is the most likely consequence during ventricular contraction?

Accepted Answer

The AV valves may prolapse, causing regurgitation of blood into the atria

Question 8

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

Accepted Answer

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

Question 9

If the papillary muscles fail to contract during systole, which of the following is most likely to occur?

Accepted Answer

The AV valves will invert, leading to blood regurgitation into the atria

Question 10

Which equation best represents the relationship between pressure, flow, and resistance in the cardiovascular system?

Accepted Answer

$$Q = \frac{\Delta P}{R}$$

Question 11

During vigorous exercise, which chamber of the heart must work hardest to maintain systemic circulation?

Accepted Answer

Left ventricle

Question 12

A patient with a defective valve between the left atrium and left ventricle is likely to experience which of the following?

Accepted Answer

Backflow of blood into the left atrium during ventricular contraction

Question 13

Which vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Question 14

Which of the following is a direct consequence of increased resistance in the systemic arteries?

Accepted Answer

Increased workload on the left ventricle

Question 15

Which of the following best explains why the right ventricle wall is thinner than the left ventricle wall?

Accepted Answer

The right ventricle only pumps blood to the lungs, which requires less pressure

Question 16

Which of the following is the correct order of heart valves encountered by blood as it flows from the right atrium to the aorta?

Accepted Answer

Tricuspid valve → pulmonary valve → mitral valve → aortic valve

Question 17

A patient with a congenital defect causing the absence of papillary muscles would most likely experience which of the following?

Accepted Answer

Prolapse of AV valves and regurgitation of blood into the atria

Question 18

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

Accepted Answer

They anchor the AV valve flaps to the papillary muscles, preventing valve inversion during ventricular contraction

Question 19

If the left ventricle fails to generate sufficient pressure, which of the following is most likely to occur?

Accepted Answer

Reduced blood flow to the systemic circulation

Question 20

Which of the following equations correctly represents cardiac output ($$CO) in $$terms of stroke volume ($$SV) $$and heart rate ($$HR$$)?

Accepted Answer

$$CO = SV 	imes HR$$

Cardiac Anatomy and Physiology: Study Guide

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