Question 1

Figure 18.4Using Figure 18.4, match the following:
-Mitral valve.

Accepted Answer

The answer of  Figure 18.4Using Figure 18.4, match the...

Question 2

Tissues damaged by myocardial infarction are replaced by connective tissue.

Accepted Answer

A) True 
 B)False

Question 3

Figure 18.4Using Figure 18.4, match the following:
-Tricuspid valve.

Accepted Answer

The answer of  Figure 18.4Using Figure 18.4, match the...

Question 4

The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it .

Accepted Answer

A)   expands the thoracic cage
B)   pumps a greater volume of blood
C)   sends blood through a smaller valve
D)   pumps blood against a greater resistanceE) All of the above
F) B) and C)

Question 5

Figure 18.4Using Figure 18.4, match the following:
-Right atrium.

Accepted Answer

The answer of  Figure 18.4Using Figure 18.4, match the...

Question 6

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

Accepted Answer

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

Question 7

Figure 18.2Using Figure 18.2, match the following:
-Atrial depolarization.

Accepted Answer

The answer of  Figure 18.2Using Figure 18.2, match the...

Question 8

Compared to skeletal muscle, cardiac muscle _ _.

Accepted Answer

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

Question 9

An ECG provides direct information about valve function.

Accepted Answer

A) True 
 B)False

Question 10

Figure 18.2Using Figure 18.2, match the following:
-Ventricular repolarization.

Accepted Answer

The answer of  Figure 18.2Using Figure 18.2, match the...

Question 11

Figure 18.4Using Figure 18.4, match the following:
-Why is fibrosis of the cardiac muscle serious?

Accepted Answer

With fibrosis the heart muscle stiffens ...

Question 12

Auricles slightly increase blood volume in the ventricles.

Accepted Answer

A) True 
 B)False

Question 13

Figure 18.1Using Figure 18.1, match the following:
-What is the functional importance of the intercalated discs of cardiac muscle? What is the functional importance of the fibrous skeleton of the heart?

Accepted Answer

Intercalated discs contain anchoring des...

Question 14

Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole.

Accepted Answer

A) True 
 B)False

Question 15

The condition where fluid compresses the heart and limits its ability to contract is called .

Accepted Answer

A)   cardiac tamponade
B)   myocardial infarction
C)   angina pectoris
D)   pericarditisE) B) and C)
F) B) and D)

Question 16

During contraction of heart muscle cells .

Accepted Answer

A)   the action potential is initiated by voltage- gated slow calcium channels
B)   the action potential is prevented from spreading from cell to cell by gap junctions
C)   some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
D)   calcium is prevented from entering cardiac fibers that have been stimulatedE) A) and D)
F) All of the above

Question 17

Norepinephrine acts on the heart by .

Accepted Answer

A)   causing a decrease in stroke volume
B)   causing threshold to be reached more quickly
C)   decreasing heart contractility
D)   blocking the action of calciumE) None of the above
F) C) and D)

Question 18

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

Accepted Answer

1. Preload - the degree to which heart m...

Question 19

Asystole is the total absence of ventricular electrical activity. Explain why defibrillation would not be effective in this situation.

Accepted Answer

Defibrillation is accomplished by electr...

Question 20

Figure 18.2Using Figure 18.2, match the following:
-Point that represents the "dup" sound made by the heart.

Accepted Answer

The answer of  Figure 18.2Using Figure 18.2, match the...

Exam 18: The Cardiovascular System: the Heart

Figure 18.2Using Figure 18.2, match the following: -Ventricular repolarization.

Correct AnswerverifiedShow Answer

Compared to skeletal muscle, cardiac muscle _ _.

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Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole.

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Figure 18.4Using Figure 18.4, match the following: -Mitral valve.

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The condition where fluid compresses the heart and limits its ability to contract is called .

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Figure 18.4Using Figure 18.4, match the following: -Why is fibrosis of the cardiac muscle serious?

Correct AnswerverifiedWith fibrosis the heart muscle stiffens ...View AnswerShow Answer

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

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An ECG provides direct information about valve function.

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Norepinephrine acts on the heart by .

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Figure 18.2Using Figure 18.2, match the following: -Point that represents the "dup" sound made by the heart.

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Figure 18.4Using Figure 18.4, match the following: -Tricuspid valve.

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Auricles slightly increase blood volume in the ventricles.

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The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it .

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Figure 18.2Using Figure 18.2, match the following: -Atrial depolarization.

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Figure 18.1Using Figure 18.1, match the following: -What is the functional importance of the intercalated discs of cardiac muscle? What is the functional importance of the fibrous skeleton of the heart?

Correct AnswerverifiedIntercalated discs contain anchoring des...View AnswerShow Answer

Tissues damaged by myocardial infarction are replaced by connective tissue.

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Figure 18.4Using Figure 18.4, match the following: -Right atrium.

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

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

Asystole is the total absence of ventricular electrical activity. Explain why defibrillation would not be effective in this situation.

Correct AnswerverifiedDefibrillation is accomplished by electr...View AnswerShow Answer

During contraction of heart muscle cells .

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With fibrosis the heart muscle stiffens ...
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Intercalated discs contain anchoring des...
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Correct Answer
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Correct Answer
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1. Preload - the degree to which heart m...
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Correct Answer
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Defibrillation is accomplished by electr...
View Answer

Correct Answer
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