Question 1

Which blood vessel carries blood from the left ventricle?

Accepted Answer

A)  aorta
B)  right atrium
C)  pulmonary trunk
D)  pulmonary arteries
E)  pulmonary veinsF) All of the above
G) B) and E)

Question 2

During the ejection phase of the cardiac cycle,blood exits the left ventricle through the

Accepted Answer

A)  aorta.
B)  coronary sinus.
C)  pulmonary vein.
D)  superior vena cava.
E)  pulmonary trunk.F) A) and B)
G) All of the above

Question 3

Which of the following sequences for the conducting system is correct?

Accepted Answer

A)  AV node,AV bundle,SA node,Purkinje fibers,bundle branches
B)  Purkinje fibers,bundle branches,AV node,AV bundle,SA node
C)  SA node,AV node,AV bundle,bundle branches,Purkinje fibers
D)  SA node,AV bundle,AV node,bundle branches,Purkinje fibers
E)  AV node,SA node,bundle branches,AV bundle,Purkinje fibersF) None of the above
G) B) and D)

Question 4

Energy for contraction of myocardial cells comes primarily from

Accepted Answer

A)  aerobic respiration in the mitochondria.
B)  anaerobic respiration in the cytosol.
C)  glycolysis in the cytosol.
D)  ATP that is stored while the heart is not contracting.
E)  creatine phosphate.F) D) and E)
G) None of the above

Question 5

An increase in extracellular calcium generally increases

Accepted Answer

A)  the heart rate.
B)  the force of contraction.
C)  autonomic stimulation of the heart.
D)  sodium channel opening.
E)  the frequency of the action potentials.F) A) and E)
G) A) and D)

Question 6

What occurs during the time between the first heart sound and the second heart sound?

Accepted Answer

A)  ventricular systole
B)  ventricular diastole
C)  ventricular filling
D)  atrial systole
E)  the P wave of the ECGF) A) and B)
G) B) and E)

Question 7

Which of the following will increase the heart rate?

Accepted Answer

A)  a rise in pH
B)  an increase in the level of carbon dioxide in the blood
C)  an increase in the level of blood oxygen
D)  an increase in blood pressure
E)  a decrease in the level of carbon dioxide in the bloodF) A) and B)
G) A) and C)

Question 8

What event(s) occur during the QRS complex of an ECG?

Accepted Answer

A)  depolarization of the atria
B)  repolarization of the ventricles
C)  depolarization of the atria and repolarization of the ventricles
D)  depolarization of the ventricles and repolarization of the atriaE) A) and D)
F) B) and C)

Question 9

The heart

Accepted Answer

A)  is a four-chambered muscular pump.
B)  is posterior to the trachea.
C)  is lined with an epithelial layer called epicardium.
D)  lies mostly to the right of the midline of the sternum.
E)  has a superior apex and an inferior base.F) D) and E)
G) A) and C)

Question 10

Variations in respiratory rate is a symptom of

Accepted Answer

A)  sinus arrhythmia.
B)  ventricular tachycardia.
C)  SA node block.
D)  paroxysmal atrial tachycardiaE) None of the above
F) A) and B)

Question 11

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

Accepted Answer

A)  streptokinase
B)  tissue plasminogen activator (t-Pa) 
C)  nitroglycerin
D)  urokinaseE) All of the above
F) None of the above

Question 12

Which of the following layers forms the bulk of the heart wall?

Accepted Answer

A)  epicardium
B)  pericardium
C)  endocardium
D)  myocardium
E)  visceral pericardiumF) B) and C)
G) D) and E)

Question 13

Which of the following statements regarding intrinsic regulation of the heart is true?

Accepted Answer

A)  Stretching the SA node will decrease generation of action potentials in the node.
B)  Decreased venous return increases cardiac output.
C)  The heart's pumping effectiveness is greatly influenced by small changes in afterload.
D)  If cardiac muscle fibers are slightly stretched,they have a stronger contraction force.
E)  If cardiac muscle fibers are slightly stretched,they have a weaker contraction force.F) A) and B)
G) C) and D)

Question 14

An incompetent pulmonary semilunar valve could result in less blood reaching the

Accepted Answer

A)  lungs.
B)  heart muscle.
C)  right ventricle.
D)  aorta.
E)  right atrium.F) A) and B)
G) A) and C)

Question 15

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 D)

Question 16

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) B) and E)
G) C) and D)

Question 17

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) A) and C)
G) B) and D)

Question 18

Calcium channel blockers are frequently used to

Accepted Answer

A)  increase the heart rate.
B)  treat tachycardia or other arrhythmias.
C)  speed up conduction of impulses through the AV node.
D)  slow the closing of potassium ion channels.
E)  treat bradycardia and low blood pressure.F) B) and E)
G) A) and E)

Question 19

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) A) and B)
G) A) and C)

Question 20

Which of the following will depolarize immediately after the AV node depolarizes?

Accepted Answer

A)  the AV bundle
B)  Purkinje fibers
C)  atrial myocardium
D)  bundle branches in the ventricular septum
E)  the SA nodeF) B) and E)
G) A) and E)

Exam 20: Cardiovascular System: the Heart

Which of the following will depolarize immediately after the AV node depolarizes?

Correct AnswerverifiedShow Answer

An increase in extracellular calcium generally increases

Correct AnswerverifiedShow Answer

Variations in respiratory rate is a symptom of

Correct AnswerverifiedShow Answer

Energy for contraction of myocardial cells comes primarily from

Correct AnswerverifiedShow Answer

The heart

Correct AnswerverifiedShow Answer

The function of the pericardial fluid is to

Correct AnswerverifiedShow Answer

What occurs during the time between the first heart sound and the second heart sound?

Correct AnswerverifiedShow Answer

Which of the following layers forms the bulk of the heart wall?

Correct AnswerverifiedShow Answer

Which blood vessel carries blood from the left ventricle?

Correct AnswerverifiedShow Answer

Which of the following will increase the heart rate?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following sequences for the conducting system is correct?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

Correct AnswerverifiedShow Answer

Calcium channel blockers are frequently used to

Correct AnswerverifiedShow Answer

Which of these statements is true?

Correct AnswerverifiedShow Answer

During the ejection phase of the cardiac cycle,blood exits the left ventricle through the

Correct AnswerverifiedShow Answer

What event(s) occur during the QRS complex of an ECG?

Correct AnswerverifiedShow Answer

Which of the following statements regarding intrinsic regulation of the heart is true?

Correct AnswerverifiedShow Answer

An incompetent pulmonary semilunar valve could result in less blood reaching the

Correct AnswerverifiedShow Answer

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