Question 1

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 calcium 
A)  causing a decrease in stroke volume 
B)  causing threshold to be reached more quickly 
C)  decreasing heart contractility 
D)  blocking the action of calcium

Question 2

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...

Question 3

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 increase 
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 increase

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

Auricles slightly increase blood volume in the ventricles.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

1. Preload - the degree to which heart m

Question 8

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 stimulated 
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 stimulated

Question 9

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 cell 
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 cell

Question 10

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 11

An ECG provides direct information about valve function.

Accepted Answer

A) True 
 B)False

Question 12

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 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

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 17

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)  pericarditis 
A)  cardiac tamponade 
B)  myocardial infarction 
C)  angina pectoris 
D)  pericarditis

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

Tissues damaged by myocardial infarction are replaced by connective tissue.

Accepted Answer

A) True 
 B)False

Question 20

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 resistance 
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 resistance

Exam 18: The Cardiovascular System: the Heart

Norepinephrine acts on the heart by .

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

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

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

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

Auricles slightly increase blood volume in the ventricles.

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

During contraction of heart muscle cells .

Compared to skeletal muscle, cardiac muscle _ _.

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

An ECG provides direct information about valve function.

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?

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

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

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

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

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

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

Tissues damaged by myocardial infarction are replaced by connective tissue.

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

The Human Body: an Orientation

Chemistry Comes Alive

Cells: the Living Units

Tissue: the Living Fabric

The Integumentary System

Bones and Skeletal Tissues

The Skeleton

Joints

Muscles and Muscle Tissue

The Muscular System

Fundamentals of the Nervous System and Nervous Tissue

The Central Nervous System

The Peripheral Nervous System and Reflex Activity

The Autonomic Nervous System

The Special Senses

The Endocrine System

Blood

The Cardiovascular System: Blood Vessels

The Lymphatic System and Lymphoid Organs and Tissues

The Immune System: Innate and Adaptive Body Defensives

The Respiratory System

The Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

The Urinary System

Fluid, Electrolyte, and Acid-Base Balance

The Reproductive System

Pregnancy and Human Development

Heredity

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