Question 1

The right and left atria depolarize and contract following the arrival of the action potential from the:

Accepted Answer

A)   atrioventricular (AV)  node.
B)   Purkinje fibers.
C)   sinoatrial (S
A)   node.
D)   atrioventricular (AV)  bundle.

Question 2

Which of the following pacemaker cell populations has the fastest intrinsic rate of depolarization at about 60 times per minute?

Accepted Answer

A)   atrioventricular (AV)  node
B)   Purkinje fiber system
C)   sinoatrial (S
A)   node
D)   atrioventricular (AV)  bundle

Question 3

What valve prevents the backflow of blood from the right ventricle into the right atrium?

Accepted Answer

A)   right atrioventricular valve (tricuspid valve) 
B)   pulmonary valve
C)   aortic valve
D)   left atrioventricular valve (mitral or bicuspid valve)

Question 4

The length of the cardiac action potential, at 200 -300 msec, is dependent upon the:

Accepted Answer

A)   initial repolarization phase.
B)   repolarization phase.
C)   plateau phase.
D)   rapid depolarization phase.

Question 5

End -diastolic volume for each ventricle during rest is normally about:

Accepted Answer

A)   120 ml.
B)   25 ml.
C)   50 ml.
D)   70 ml.

Question 6

Predict the position of the valves when the ventricles contract.

Accepted Answer

A)   Both AV valves and semilunar valves are forced shut.
B)   Both AV valves are forced open while both semilunar valves are forced shut.
C)   Both AV valves and semilunar valves are forced open.
D)   Both AV valves are forced shut while both semilunar valves are forced open. D

Question 7

What vessel(s)  deliver oxygenated blood to the left atrium?

Accepted Answer

A)   pulmonary arteries
B)   pulmonary trunk
C)   pulmonary veins
D)   aorta

Question 8

Discuss the five waves seen on an electrocardiogram (ECG) and explain what they represent.

Accepted Answer

The five waves seen on an electrocardiog...

Question 9

Afterload is described as:

Accepted Answer

A)   the force the ventricles must overcome to eject blood into their respective arteries.
B)   the ability to generate tension.
C)   the length or degree of stretch of the sarcomeres in the ventricular cells before they contract.
D)   the amount of blood that has drained into the ventricle by the end of the filling phase.

Question 10

The amount of blood remaining in each ventricle at the end of the ventricular ejection phase is normally about:

Accepted Answer

A)   120 ml.
B)   70 ml.
C)   50 ml.
D)   30 ml.

Question 11

What produces the "lub dub" heart sounds?

Accepted Answer

A)   the vibrations of the ventricular and blood vessel walls when valves shut
B)   the sound of blood traveling through the heart
C)   the relaxation of the atria, and then the ventricles
D)   the contraction of the atria, and then the ventricles A

Question 12

Blood in the right atrium should travel next past the:

Accepted Answer

A)   tricuspid valve and into the right ventricle.
B)   pulmonary trunk to the pulmonary capillaries.
C)   pulmonary valve and into the pulmonary trunk.
D)   mitral valve and into the left ventricle.

Question 13

Discuss the chronotropic effects of the sympathetic and parasympathetic nervous systems on the heart.

Accepted Answer

The sympathetic nervous system releases ...

Question 14

What normally serves as the pacemaker of the entire heart?

Accepted Answer

A)   Purkinje fiber system
B)   atrioventricular (AV)  node
C)   sinoatrial (S
A)   node
D)   atrioventricular (AV)  bundle C

Question 15

How much blood is pumped from each ventricle during the ventricular ejection phase?

Accepted Answer

A)   120 ml
B)   90 ml
C)   70 ml
D)   50 ml

Question 16

Determine the effects to blood flow if a heart attack has caused damaged to the left side of the heart.

Accepted Answer

The left side of the heart, often called...

Question 17

Match the following with the waves, segments, or intervals on the electrocardiogram (ECG).
 
-Identify the complex representing ventricular depolarization.

Accepted Answer

The answer of Match the following with the waves, segments,...

Question 18

A contractile cell with a membrane potential of 0 mV is experiencing the:

Accepted Answer

A)   initial repolarization phase.
B)   repolarization phase.
C)   rapid depolarization phase.
D)   plateau phase.

Question 19

Match the following with the waves, segments, or intervals on the electrocardiogram (ECG).
 
-Identify the interval during which the ventricles are undergoing action potentials.

Accepted Answer

The answer of Match the following with the waves, segments,...

Question 20

Which chamber experiences a maximum pressure of around 118 mm Hg during contraction?

Accepted Answer

A)   right atrium
B)   right ventricle
C)   left ventricle
D)   left atrium

Exam 17: The Cardiovascular System I: the Heart

The right and left atria depolarize and contract following the arrival of the action potential from the:

Correct AnswerverifiedShow Answer

Which of the following pacemaker cell populations has the fastest intrinsic rate of depolarization at about 60 times per minute?

Correct AnswerverifiedShow Answer

What valve prevents the backflow of blood from the right ventricle into the right atrium?

Correct AnswerverifiedShow Answer

The length of the cardiac action potential, at 200 -300 msec, is dependent upon the:

Correct AnswerverifiedShow Answer

End -diastolic volume for each ventricle during rest is normally about:

Correct AnswerverifiedShow Answer

Predict the position of the valves when the ventricles contract.

Correct AnswerverifiedD

What vessel(s) deliver oxygenated blood to the left atrium?

Correct AnswerverifiedShow Answer

Discuss the five waves seen on an electrocardiogram (ECG) and explain what they represent.

Correct AnswerverifiedThe five waves seen on an electrocardiog...View AnswerShow Answer

Afterload is described as:

Correct AnswerverifiedShow Answer

The amount of blood remaining in each ventricle at the end of the ventricular ejection phase is normally about:

Correct AnswerverifiedShow Answer

What produces the "lub dub" heart sounds?

Correct AnswerverifiedA

Blood in the right atrium should travel next past the:

Correct AnswerverifiedShow Answer

Discuss the chronotropic effects of the sympathetic and parasympathetic nervous systems on the heart.

Correct AnswerverifiedThe sympathetic nervous system releases ...View AnswerShow Answer

What normally serves as the pacemaker of the entire heart?

Correct AnswerverifiedC

How much blood is pumped from each ventricle during the ventricular ejection phase?

Correct AnswerverifiedShow Answer

Determine the effects to blood flow if a heart attack has caused damaged to the left side of the heart.

Correct AnswerverifiedThe left side of the heart, often called...View AnswerShow Answer

Match the following with the waves, segments, or intervals on the electrocardiogram (ECG). -Identify the complex representing ventricular depolarization.

Correct AnswerverifiedShow Answer

A contractile cell with a membrane potential of 0 mV is experiencing the:

Correct AnswerverifiedShow Answer

Match the following with the waves, segments, or intervals on the electrocardiogram (ECG). -Identify the interval during which the ventricles are undergoing action potentials.

Correct AnswerverifiedShow Answer

Which chamber experiences a maximum pressure of around 118 mm Hg during contraction?

Correct AnswerverifiedShow Answer

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The length of the cardiac action potential, at 200 ^-300 msec, is dependent upon the:

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End ^-diastolic volume for each ventricle during rest is normally about:

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D

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The five waves seen on an electrocardiog...
View Answer

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A

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The sympathetic nervous system releases ...
View Answer

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C

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The left side of the heart, often called...
View Answer

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Correct Answer
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