Question 1

Myofibrils within cardiac muscle cells are aligned in sarcomeres.

Accepted Answer

A) True 
 B)False

Question 2

Cardiac output equals the

Accepted Answer

A)  end diastolic volume minus end systolic volume.
B)  blood pressure multiplied by heart rate.
C)  heart rate multiplied by stroke volume.
D)  stroke volume divided by heart rate.
E)  cardiac reserve minus the stroke volume.F) C) and D)
G) A) and D)

Question 3

An autorhythmic heart cell is one in which

Accepted Answer

A)  action potentials fire spontaneoulsy.
B)  action potentials are stimulated by internal stores of acetylcholine.
C)  action potentials always occur at exactly the same frequency.
D)  all filaments contract and relax with a high degree of synchrony.
E)  action potentials are initiated by the autonomic nervous system.F) A) and E)
G) A) and D)

Question 4

The atria are separated from the ventricles externally by the

Accepted Answer

A)  anterior interventricular sulcus.
B)  posterior interventricular sulcus.
C)  sinoventricular sulcus.
D)  coronary sulcus.
E)  None of the choices is correct.F) D) and E)
G) A) and C)

Question 5

-In this figure showing an anterior view of the heart,the left atrium is noted by number

Accepted Answer

A)  1.
B)  2.
C)  3.
D)  4.
E)  5.F) A) and B)
G) C) and D)

Question 6

What part of the cardiac conduction system is located in the posterior wall of the right atrium,adjacent to the entrance of the superior vena cava

Accepted Answer

A)  AV bundle
B)  Bundle branches
C)  Purkinje fibers
D)  AV node
E)  SA nodeF) B) and C)
G) B) and D) E

Question 7

Which can be used to characterize blood flow in the human body
A: There is a unidirectional blood flow.
B: Arteries always carry oxygenated blood.
C: Veins always carry deoxygenated blood.
D: Arteries carry blood away from the heart.
E: Veins carry blood toward the heart.

Accepted Answer

A)  a,c,d,e
B)  a,b,c,d,e
C)  a,d,e
D)  b,c,d,e
E)  d,eF) A) and B)
G) A) and E)

Question 8

Purkinje fibers are small fibers within the atria that conduct impulses rapidly.

Accepted Answer

A) True 
 B)False

Question 9

The inferior chambers of the heart are called ________________.

Accepted Answer

The answer of The inferior chambers of the heart are...

Question 10

The anterior part of each atrium is a flaplike extension called a(n)_______________.

Accepted Answer

The answer of The anterior part of each atrium is...

Question 11

Preload is the stretch of the heart wall as determined by the amount of blood returned by the veins.

Accepted Answer

A) True 
 B)False

Question 12

Vagal tone refers to the

Accepted Answer

A)  decreasing of the heart rate below its inherent rhythm by parasympathetic stimulation.
B)  decreasing of the heart rate below its inherent rhythm by sympathetic stimulation.
C)  increasing of the heart rate above its inherent rhythm by sympathetic stimulation.
D)  increasing of the heart rate above its inherent rhythm by parasympathetic stimulation.E) A) and B)
F) A) and C) A

Question 13

Coronary vessels are open when the heart is

Accepted Answer

A)  contracting.
B)  relaxed.C) A) and B)
D) undefined

Question 14

About 70% of the ventricle filling is achieved passively without the contraction of the atria.

Accepted Answer

A) True 
 B)False

Question 15

Arteries carry blood toward the heart,while veins carry blood away from the heart.

Accepted Answer

A) True 
 B)False

Question 16

For the repolarization phase of an SA nodal cell action potential,

Accepted Answer

A)  sodium and potassium channels open.
B)  calcium channels open and sodium channels close.
C)  calcium and potassium channels close.
D)  calcium channels close and potassium channels open.
E)  sodium and chloride channels open.F) B) and E)
G) A) and B)

Question 17

The tetralogy of Fallot is

Accepted Answer

A)  a condition in which the left and right sides of the heart are completely reversed.
B)  a developmental disorder that is a cardiac septal defect.
C)  an exceptionally fast heart rate.
D)  an inadequate cardiac output due to poorly contracting heart chambers.
E)  occlusion of the left coronary artery.F) A) and B)
G) A) and C) B

Question 18

If the stroke volume is unequal between the left and right ventricles,________ may occur,which is excess fluid surrounding or within cells.

Accepted Answer

The answer of If the stroke volume is unequal between...

Question 19

Which valve prevents the backflow of blood into the left ventricle when the ventricles relax

Accepted Answer

A)  Left atrioventricular valve
B)  Aortic semilunar valve
C)  Right atrioventricular valve
D)  Pulmonary semilunar valve
E)  None of the choices is correct.F) A) and B)
G) B) and C)

Question 20

The atrioventricular (AV) node is located in the

Accepted Answer

A)  floor of the left atrium.
B)  floor of the right atrium.
C)  roof of the left ventricle.
D)  back wall of the right ventricle.
E)  back wall of the left ventricle.F) C) and D)
G) B) and D)

Exam 19: Cardiovascular System: Heart

Myofibrils within cardiac muscle cells are aligned in sarcomeres.

Correct AnswerverifiedShow Answer

Cardiac output equals the

Correct AnswerverifiedShow Answer

An autorhythmic heart cell is one in which

Correct AnswerverifiedShow Answer

The atria are separated from the ventricles externally by the

Correct AnswerverifiedShow Answer

-In this figure showing an anterior view of the heart,the left atrium is noted by number

Correct AnswerverifiedShow Answer

What part of the cardiac conduction system is located in the posterior wall of the right atrium,adjacent to the entrance of the superior vena cava

Correct AnswerverifiedE

Which can be used to characterize blood flow in the human body A: There is a unidirectional blood flow. B: Arteries always carry oxygenated blood. C: Veins always carry deoxygenated blood. D: Arteries carry blood away from the heart. E: Veins carry blood toward the heart.

Correct AnswerverifiedShow Answer

Purkinje fibers are small fibers within the atria that conduct impulses rapidly.

Correct AnswerverifiedShow Answer

The inferior chambers of the heart are called ________________.

Correct AnswerverifiedShow Answer

The anterior part of each atrium is a flaplike extension called a(n)_______________.

Correct AnswerverifiedShow Answer

Preload is the stretch of the heart wall as determined by the amount of blood returned by the veins.

Correct AnswerverifiedShow Answer

Vagal tone refers to the

Correct AnswerverifiedA

Coronary vessels are open when the heart is

Correct AnswerverifiedShow Answer

About 70% of the ventricle filling is achieved passively without the contraction of the atria.

Correct AnswerverifiedShow Answer

Arteries carry blood toward the heart,while veins carry blood away from the heart.

Correct AnswerverifiedShow Answer

For the repolarization phase of an SA nodal cell action potential,

Correct AnswerverifiedShow Answer

The tetralogy of Fallot is

Correct AnswerverifiedB

If the stroke volume is unequal between the left and right ventricles,________ may occur,which is excess fluid surrounding or within cells.

Correct AnswerverifiedShow Answer

Which valve prevents the backflow of blood into the left ventricle when the ventricles relax

Correct AnswerverifiedShow Answer

The atrioventricular (AV) node is located in the

Correct AnswerverifiedShow Answer

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E

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A

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B

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