Question 1

An extended period of time between the P wave and the QRS complex may indicate which of the following?

Accepted Answer

A)  The signal is taking too long to get to the AV node.
B)  The signal is traveling too quickly to the AV node.
C)  Ventricular contraction is taking longer than usual.
D)  Ventricular contraction is faster than usual.
E)  The atria are not contracting.F) C) and D)
G) A) and E)

Question 2

Obstruction of the ___________ will cause a more severe myocardial infarction (MI) than the obstruction of any of the others.

Accepted Answer

A)  left marginal vein
B)  left coronary artery (LC
A)  
C)  posterior interventricular vein
D)  anterior interventricular branch
E)  circumflex branchF) B) and C)
G) B) and E)

Question 3

Which of the following is the most superficial layer enclosing the heart?

Accepted Answer

A)  Parietal pericardium
B)  Visceral pericardium
C)  Endocardium
D)  Epicardium
E)  MyocardiumF) A) and E)
G) B) and C)

Question 4

The __________ provides most of the Ca2+ needed for myocardial contraction.

Accepted Answer

A)  extracellular fluid
B)  mitochondria
C)  sarcoplasmic reticulum
D)  Golgi apparatus
E)  cytoskeletonF) B) and E)
G) A) and E)

Question 5

The Frank-Starling law of the heart states that stroke volume is proportional to __________.

Accepted Answer

A)  the end-systolic volume
B)  the end-diastolic volume
C)  the afterload
D)  the heart rate
E)  contractilityF) A) and E)
G) B) and D)

Question 6

Stroke volume is increased by __________.

Accepted Answer

A)  high arterial blood pressure
B)  negative inotropic agents
C)  increased venous return
D)  increased afterload
E)  dehydrationF) A) and C)
G) D) and E)

Question 7

The __________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.

Accepted Answer

A)  right atrioventricular
B)  left atrioventricular
C)  aortic
D)  pulmonary
E)  mitralF) C) and D)
G) B) and E)

Question 8

The pacemaker potential is a result of _________.

Accepted Answer

A)  Na+ inflow
B)  Na+ outflow
C)  K+ inflow
D)  K+ outflow
E)  Ca2+ inflowF) A) and B)
G) A) and D)

Question 9

The systemic circuit contains oxygen-rich blood only.

Accepted Answer

A) True 
 B)False

Question 10

When sodium channels are fully open,the membrane of the ventricular cardiocyte _________.

Accepted Answer

A)  sharply hyperpolarizes
B)  sharply repolarizes
C)  sharply depolarizes
D)  plateaus
E)  has no reponseF) All of the above
G) A) and B)

Question 11

The right atrioventricular valve (tricuspid) regulates the opening between the _________ and the _________.

Accepted Answer

A)  right atrium; left atrium
B)  right atrium; right ventricle
C)  right atrium; left ventricle
D)  left atrium; left ventricle
E)  left ventricle; right ventricleF) B) and D)
G) A) and D)

Question 12

Atrial depolarization causes the _________.

Accepted Answer

A)  P wave
B)  QRS complex
C)  T wave
D)  first heart sound
E)  quiescent periodF) A) and E)
G) A) and D)

Question 13

If the SA node is damaged,nodal rhythm is sufficient to sustain life.

Accepted Answer

A) True 
 B)False

Question 14

Ventricular pressure increases the fastest during ventricular filling.

Accepted Answer

A) True 
 B)False

Question 15

The plateau in the action potential of cardiac muscle results from the action of __________.

Accepted Answer

A)  Na+ inflow
B)  K+ inflow
C)  K+ outflow
D)  fast Ca2+ channels
E)  slow Ca2+ channelsF) None of the above
G) All of the above

Question 16

In a normal ECG,the deflection that is generated by ventricular repolarization is called the __________.

Accepted Answer

A)  R wave
B)  QRS wave
C)  P wave
D)  S wave
E)  T waveF) A) and E)
G) B) and D)

Question 17

The fibrous skeleton of the heart serves as electrical insulation between the atria and the ventricles.

Accepted Answer

A) True 
 B)False

Question 18

Most of the ventricle filling occurs __________.

Accepted Answer

A)  during atrial systole
B)  when the AV valve is closed
C)  during ventricular systole
D)  during atrial diastole
E)  during isovolumetric contractionF) All of the above
G) A) and E)

Question 19

Mitral valve prolapse causes blood to leak back into the __________ when the ventricles contract.

Accepted Answer

A)  left atrium
B)  right atrium
C)  aorta
D)  pulmonary trunk
E)  pulmonary arteriesF) A) and D)
G) None of the above

Question 20

Which of the following carry oxygen-poor blood?

Accepted Answer

A)  Pulmonary veins and vena cavae
B)  Aorta and pulmonary veins
C)  Aorta and vena cavae
D)  Venae cavae and pulmonary arteries
E)  Pulmonary veins and pulmonary arteriesF) A) and E)
G) B) and E)

Exam 19: The Circulatory System: Heart

The systemic circuit contains oxygen-rich blood only.

Correct AnswerverifiedShow Answer

Stroke volume is increased by __________.

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Ventricular pressure increases the fastest during ventricular filling.

Correct AnswerverifiedShow Answer

Mitral valve prolapse causes blood to leak back into the __________ when the ventricles contract.

Correct AnswerverifiedShow Answer

Obstruction of the ___________ will cause a more severe myocardial infarction (MI) than the obstruction of any of the others.

Correct AnswerverifiedShow Answer

In a normal ECG,the deflection that is generated by ventricular repolarization is called the __________.

Correct AnswerverifiedShow Answer

The Frank-Starling law of the heart states that stroke volume is proportional to __________.

Correct AnswerverifiedShow Answer

The __________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.

Correct AnswerverifiedShow Answer

If the SA node is damaged,nodal rhythm is sufficient to sustain life.

Correct AnswerverifiedShow Answer

An extended period of time between the P wave and the QRS complex may indicate which of the following?

Correct AnswerverifiedShow Answer

When sodium channels are fully open,the membrane of the ventricular cardiocyte _________.

Correct AnswerverifiedShow Answer

The right atrioventricular valve (tricuspid) regulates the opening between the _________ and the _________.

Correct AnswerverifiedShow Answer

The fibrous skeleton of the heart serves as electrical insulation between the atria and the ventricles.

Correct AnswerverifiedShow Answer

Which of the following is the most superficial layer enclosing the heart?

Correct AnswerverifiedShow Answer

The pacemaker potential is a result of _________.

Correct AnswerverifiedShow Answer

Atrial depolarization causes the _________.

Correct AnswerverifiedShow Answer

Which of the following carry oxygen-poor blood?

Correct AnswerverifiedShow Answer

The plateau in the action potential of cardiac muscle results from the action of __________.

Correct AnswerverifiedShow Answer

The __________ provides most of the Ca2+ needed for myocardial contraction.

Correct AnswerverifiedShow Answer

Most of the ventricle filling occurs __________.

Correct AnswerverifiedShow Answer

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The right atrioventricular valve (tricuspid) regulates the opening between the _ and the _.

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The __________ provides most of the Ca²⁺ needed for myocardial contraction.

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