Question 1

The AV valve that is located on the same side of the heart as the origin of the aorta is the

Accepted Answer

A)   bicuspid or mitral valve.
B)   tricuspid valve.
C)   aortic semilunar valve.
D)   pulmonary semilunar valve.
E)   coronary sinus valve.F) A) and C)
G) C) and D)

Question 2

What cardiac arrhythmia will have no QRS complex as a symptom?

Accepted Answer

A)   atrial fibrillation
B)   ventricular fibrillation
C)   bradycardia
D)   premature ventricular contractionsE) B) and D)
F) A) and D)

Question 3

The relationship between preload and stroke volume is known as

Accepted Answer

A)   extrinsic regulation.
B)   cardiac reserve.
C)   Starling Law of the heart.
D)   minute volume.E) A) and B)
F) B) and C)

Question 4

The function of the pericardial fluid is to

Accepted Answer

A)   reduce friction between the pericardial membranes.
B)   lubricate the heart valves.
C)   replace any blood that is lost.
D)   provide oxygen and nutrients to the endocardium.
E)   stimulate the heart.F) B) and E)
G) None of the above

Question 5

Which of the following areas of the conduction system would produce spontaneous action potentials most frequently if the SA node were not functioning?

Accepted Answer

A)   AV bundle
B)   Purkinje fibers
C)   AV node
D)   bundle branch
E)   the pacemakerF) All of the above
G) C) and D)

Question 6

A serious condition in which a large amount of fluid accumulates in the pericardial cavity and puts pressure of the heart is

Accepted Answer

A)   endocarditis.
B)   pericarditis.
C)   a myocardial infarction.
D)   cardiac tamponade.E) C) and D)
F) B) and C)

Question 7

As soon as left ventricular pressure exceeds the pressure in the aorta, the

Accepted Answer

A)   AV valves open.
B)   aortic semilunar valve opens.
C)   atria pump blood into the ventricles.
D)   ventricles pump blood into the atria.
E)   pulmonary semilunar valve closes.F) A) and B)
G) A) and C)

Question 8

Which of the following events occurs first?

Accepted Answer

A)   threshold
B)   depolarization
C)   early repolarization
D)   final repolarization
E)   pacemaker potentialF) A) and D)
G) A) and C)

Question 9

What is the importance of the delay in the action potential in the AV node?

Accepted Answer

A)   It allows the action potential to reach both ventricles at the same time.
B)   It allows an action potential to reach the left atrium so both atria contract together.
C)   It allows an action potential to reach the left atrium so both atria contract together, before the ventricles contract.
D)   It allows time for the atria to be filled with blood.E) B) and D)
F) C) and D)

Question 10

The cardiac electrical impulse normally begins spontaneously in the SA node because

Accepted Answer

A)   of the superior location of the SA node in the right atrium.
B)   the SA node is the only area of the heart capable of spontaneous depolarization.
C)   of the rich sympathetic innervation of the SA node.
D)   this area produces action potentials more rapidly than any other portion of the conduction system.
E)   of action potentials from the cardioregulatory center.F) C) and D)
G) A) and C)

Question 11

The ion primarily responsible for depolarization in pacemaker cells is ______________, whereas the ion primarily responsible for this in other cardiac cells is _____________.

Accepted Answer

A)   sodium; calcium
B)   calcium; sodium
C)   potassium; sodium
D)   calcium; potassiumE) A) and B)
F) A) and C)

Question 12

Which of these statements is true?

Accepted Answer

A)   The left coronary artery is a branch of the left pulmonary vein.
B)   The coronary sinus returns blood to the left atrium.
C)   The coronary arteries arise from the pulmonary trunk.
D)   The great cardiac vein collects blood from the left anterior surface of the heart.
E)   The pulmonary arteries carry blood to the left atrium.F) A) and D)
G) None of the above

Question 13

Blood in the superior vena cava will enter the _____.

Accepted Answer

A)   aorta
B)   right atrium
C)   pulmonary trunk
D)   pulmonary arteries
E)   pulmonary veinsF) A) and B)
G) A) and E)

Question 14

Which of the following factors would cause an increase in heart rate?

Accepted Answer

A)   increased parasympathetic stimulation
B)   stimulation of baroreceptors in the aorta
C)   increased epinephrine release from the adrenal medulla
D)   increased production of atrial natriuretic factor
E)   vagal stimulationF) B) and E)
G) B) and C)

Question 15

Stimulation of the heart via the sympathetic nerves would

Accepted Answer

A)   decrease heart rate.
B)   decrease stroke volume.
C)   increase the force of ventricular contraction.
D)   increase end-systolic volume.
E)   not affect heart rate and force of contraction.F) B) and E)
G) A) and B)

Question 16

Under resting conditions, the normal stroke volume is approximately ___________.

Accepted Answer

A)   55 mL
B)   70 mL
C)   110 mL
D)   125 mL
E)   180 mLF) None of the above
G) B) and D)

Question 17

The P wave of an ECG indicates

Accepted Answer

A)   atrial depolarization.
B)   atrial repolarization.
C)   ventricular depolarization.
D)   ventricular repolarization.
E)   threshold.F) All of the above
G) C) and E)

Question 18

Which of the following is mismatched?

Accepted Answer

A)   opening of sodium channels - depolarization
B)   closing of calcium channels - plateau phase
C)   opening of potassium channels - rapid repolarization
D)   closure of sodium channels - early repolarization
E)   opening of calcium channels - plateau phaseF) A) and E)
G) A) and C)

Question 19

End-diastolic volume minus end-systolic volume is equal to

Accepted Answer

A)   cardiac output.
B)   cardiac reserve.
C)   pulse volume.
D)   venous return.
E)   stroke volume.F) A) and B)
G) A) and C)

Question 20

The action potentials are slowed at the AV node to allow the

Accepted Answer

A)   ventricles to repolarize.
B)   ventricles to completely empty of blood.
C)   pacemaker to reset for the next beat.
D)   atria to complete their contraction.
E)   atria to begin their contraction.F) A) and D)
G) C) and E)

Exam 20: Cardiovascular System: the Heart

The P wave of an ECG indicates

Correct AnswerverifiedShow Answer

What cardiac arrhythmia will have no QRS complex as a symptom?

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The relationship between preload and stroke volume is known as

Correct AnswerverifiedShow Answer

What is the importance of the delay in the action potential in the AV node?

Correct AnswerverifiedShow Answer

The AV valve that is located on the same side of the heart as the origin of the aorta is the

Correct AnswerverifiedShow Answer

The action potentials are slowed at the AV node to allow the

Correct AnswerverifiedShow Answer

Stimulation of the heart via the sympathetic nerves would

Correct AnswerverifiedShow Answer

A serious condition in which a large amount of fluid accumulates in the pericardial cavity and puts pressure of the heart is

Correct AnswerverifiedShow Answer

End-diastolic volume minus end-systolic volume is equal to

Correct AnswerverifiedShow Answer

Which of the following is mismatched?

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Which of the following events occurs first?

Correct AnswerverifiedShow Answer

Which of the following areas of the conduction system would produce spontaneous action potentials most frequently if the SA node were not functioning?

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Under resting conditions, the normal stroke volume is approximately ___________.

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Blood in the superior vena cava will enter the _____.

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The ion primarily responsible for depolarization in pacemaker cells is ______________, whereas the ion primarily responsible for this in other cardiac cells is _____________.

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Which of the following factors would cause an increase in heart rate?

Correct AnswerverifiedShow Answer

The cardiac electrical impulse normally begins spontaneously in the SA node because

Correct AnswerverifiedShow Answer

The function of the pericardial fluid is to

Correct AnswerverifiedShow Answer

Which of these statements is true?

Correct AnswerverifiedShow Answer

As soon as left ventricular pressure exceeds the pressure in the aorta, the

Correct AnswerverifiedShow Answer

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The ion primarily responsible for depolarization in pacemaker cells is __, whereas the ion primarily responsible for this in other cardiac cells is _.

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