Question 1

Define systole and diastole.Which heart chambers are usually referenced when these terms are used?

Accepted Answer

Systole is contraction of the ...

Question 2

An electrocardiogram (ECG)provides direct information about valve function.

Accepted Answer

A) True 
 B)False

Question 3

Heart tissue is supplied with nutrients primarily by diffusion from the heart chambers through the myocardium.

Accepted Answer

A) True 
 B)False

Question 4

Blood within the pulmonary veins returns to the ________.

Accepted Answer

A)  left atrium
B)  right atrium
C)  right ventricle
D)  left ventricleE) A) and D)
F) All of the above

Question 5

A patient was admitted to the hospital with chest pains.On admission,his pulse was 110 and blood pressure was 96/64.According to his history,his normal pulse rate is usually between 80 and 88 and his blood pressure runs from 120/70 to 130/80.Explain why these changes in BP and HR occur.

Accepted Answer

Increased heart rate (measured by taking...

Question 6

A patient is prescribed a calcium channel blocker to prevent angina (chest pain),by decreasing the demand for oxygen.Explain why.

Accepted Answer

By preventing the influx of calcium ions...

Question 7

When released in large quantities,thyroxine,a thyroid gland hormone,causes a sustained increase in heart rate.

Accepted Answer

A) True 
 B)False

Question 8

Select the correct statement about cardiac output.

Accepted Answer

A)  If a semilunar valve were partially obstructed,the end systolic volume in the affected ventricle would be decreased.
B)  Decreased venous return will result in increased end diastolic volume.
C)  A slow heart rate increases end diastolic volume,stroke volume,and force of contraction.
D)  Stroke volume increases if end diastolic volume decreases.E) A) and D)
F) B) and C)

Question 9

If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid,________.

Accepted Answer

A)  tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
B)  threshold is reached more quickly and heart rate would increase
C)  potassium channels compensate and no change in heart rate would occur
D)  heart rate would decrease,but blood pressure would rise due to the excess sodium presentE) None of the above
F) B) and C)

Question 10

Normal heart sounds are caused by which of the following events?

Accepted Answer

A)  friction of blood against the chamber walls
B)  closure of the heart valves
C)  opening of the heart valves
D)  excitation of the sinoatrial (S
A)  nodeE) C) and D)
F) A) and B)

Question 11

Auricles slightly increase blood volume in the ventricles.

Accepted Answer

A) True 
 B)False

Question 12

Damage to the ________ causes heart block.

Accepted Answer

A)  sinoatrial (S
A)  node
B)  atrioventricular (AV) node
C)  atrioventricular (AV) bundle
D)  atrioventricular (AV) valvesE) B) and D)
F) All of the above

Question 13

The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic semilunar valves.

Accepted Answer

A) True 
 B)False

Question 14

A 14-year-old girl undergoing a physical examination prior to being admitted to summer camp was found to have a loud diastolic murmur at the second intercostal space to the left side of the sternum.Explain the reason for the loud heart murmur associated with this girl's condition.

Accepted Answer

The heart murmur is due to inc...

Question 15

Compared to skeletal muscle,cardiac muscle ________.

Accepted Answer

A)  has more nuclei per cell
B)  lacks striations
C)  cells are larger than skeletal muscle cells
D)  has gap junctions that allow it to act as a functional syncytiumE) A) and B)
F) A) and C)

Question 16

The atrioventricular (AV) valves are closed ________.

Accepted Answer

A)  when the ventricles are in diastole
B)  while the atria are contracting
C)  when the ventricles are in systole
D)  by the movement of blood from atria to ventriclesE) None of the above
F) All of the above

Question 17

Why is oxygen so much more critical to the heart muscle than to skeletal muscles?

Accepted Answer

Cardiac muscle cells are highly dependen...

Question 18

List and define the three most important factors that affect stroke volume.

Accepted Answer

1.Preload the degree to which heart musc...

Question 19

The source of blood carried to capillaries in the myocardium would be the ________.

Accepted Answer

A)  coronary arteries
B)  coronary veins
C)  coronary sinus
D)  fossa ovalisE) All of the above
F) B) and C)

Question 20

Explain the role of pacemaker cells in cardiac tissue.

Accepted Answer

Pacemaker cells do not maintain a stable...

Exam 18: The Cardiovascular System: The Heart

The source of blood carried to capillaries in the myocardium would be the ________.

Correct AnswerverifiedShow Answer

Damage to the ________ causes heart block.

Correct AnswerverifiedShow Answer

If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid,________.

Correct AnswerverifiedShow Answer

Explain the role of pacemaker cells in cardiac tissue.

Correct AnswerverifiedPacemaker cells do not maintain a stable...View AnswerShow Answer

A 14-year-old girl undergoing a physical examination prior to being admitted to summer camp was found to have a loud diastolic murmur at the second intercostal space to the left side of the sternum.Explain the reason for the loud heart murmur associated with this girl's condition.

Correct AnswerverifiedThe heart murmur is due to inc...View AnswerShow Answer

Define systole and diastole.Which heart chambers are usually referenced when these terms are used?

Correct AnswerverifiedSystole is contraction of the ...View AnswerShow Answer

Blood within the pulmonary veins returns to the ________.

Correct AnswerverifiedShow Answer

Normal heart sounds are caused by which of the following events?

Correct AnswerverifiedShow Answer

Heart tissue is supplied with nutrients primarily by diffusion from the heart chambers through the myocardium.

Correct AnswerverifiedShow Answer

The atrioventricular (AV) valves are closed ________.

Correct AnswerverifiedShow Answer

Why is oxygen so much more critical to the heart muscle than to skeletal muscles?

Correct AnswerverifiedCardiac muscle cells are highly dependen...View AnswerShow Answer

A patient is prescribed a calcium channel blocker to prevent angina (chest pain),by decreasing the demand for oxygen.Explain why.

Correct AnswerverifiedBy preventing the influx of calcium ions...View AnswerShow Answer

A patient was admitted to the hospital with chest pains.On admission,his pulse was 110 and blood pressure was 96/64.According to his history,his normal pulse rate is usually between 80 and 88 and his blood pressure runs from 120/70 to 130/80.Explain why these changes in BP and HR occur.

Correct AnswerverifiedIncreased heart rate (measured by taking...View AnswerShow Answer

Select the correct statement about cardiac output.

Correct AnswerverifiedShow Answer

The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic semilunar valves.

Correct AnswerverifiedShow Answer

An electrocardiogram (ECG)provides direct information about valve function.

Correct AnswerverifiedShow Answer

Auricles slightly increase blood volume in the ventricles.

Correct AnswerverifiedShow Answer

When released in large quantities,thyroxine,a thyroid gland hormone,causes a sustained increase in heart rate.

Correct AnswerverifiedShow Answer

List and define the three most important factors that affect stroke volume.

Correct Answerverified1.Preload the degree to which heart musc...View AnswerShow Answer

Compared to skeletal muscle,cardiac muscle ________.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Pacemaker cells do not maintain a stable...
View Answer

Correct Answer
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The heart murmur is due to inc...
View Answer

Correct Answer
verified
Systole is contraction of the ...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Cardiac muscle cells are highly dependen...
View Answer

Correct Answer
verified
By preventing the influx of calcium ions...
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Correct Answer
verified
Increased heart rate (measured by taking...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
1.Preload the degree to which heart musc...
View Answer

Correct Answer
verified