Question 1

The first heart sound

Accepted Answer

A)  occurs when the AV valves close. 
B)  occurs when the semilunar valves close. 
C)  signals the onset of ventricular systole. 
D)  occurs when the AV valves close and signals the onset of ventricular systole. 
E)  occurs when the semilunar valves close and signals the onset of ventricular systole. 
A)  occurs when the AV valves close. 
B)  occurs when the semilunar valves close. 
C)  signals the onset of ventricular systole. 
D)  occurs when the AV valves close and signals the onset of ventricular systole. 
E)  occurs when the semilunar valves close and signals the onset of ventricular systole.

Question 2

The T wave represents the depolarization of the ventricles.

Accepted Answer

A) True 
 B)False

Question 3

An increase in parasympathetic activity ____________________ the heart rate.

Accepted Answer

The answer of An increase in parasympathetic activity ____________________ the...

Question 4

The cardiac output is equal to

Accepted Answer

A)  the difference between the end-diastolic volume (EDV) and the end-systolic volume (ESV) x HR. 
B)  the product of heart rate and EDV. 
C)  the difference between the stroke. volume at rest and the stroke volume during exercise. 
D)  the stroke volume less the end-systolic volume. 
E)  the product of heart rate and blood pressure. 
A)  the difference between the end-diastolic volume (EDV) and the end-systolic volume (ESV) x HR. 
B)  the product of heart rate and EDV. 
C)  the difference between the stroke. volume at rest and the stroke volume during exercise. 
D)  the stroke volume less the end-systolic volume. 
E)  the product of heart rate and blood pressure.

Question 5

Describe generation of pacemaker action potentials.

Accepted Answer

Pacemaker potentials in nodal pacemaker

Question 6

When the heart is sympathetically stimulated

Accepted Answer

A)  cardiac output decreases 
B)  acetylcholine is released from neuron. 
C)  norepinephrine is released onto the SA node and myocardium 
D)  Ca2+ channels open in greater numbers 
E)  both (c) and (d) above. 
A)  cardiac output decreases 
B)  acetylcholine is released from neuron. 
C)  norepinephrine is released onto the SA node and myocardium 
D)  Ca2+ channels open in greater numbers 
E)  both (c) and (d) above.

Question 7

Blood returning from the vena cava:

Accepted Answer

A)  enters the right atrium. 
B)  enters the left atrium. 
C)  is poorly oxygenated. 
D)  both (a) and (c) above. 
E)  both (b) and (c) above. 
A)  enters the right atrium. 
B)  enters the left atrium. 
C)  is poorly oxygenated. 
D)  both (a) and (c) above. 
E)  both (b) and (c) above.

Question 8

Which of the following ECG waves represents ventricular repolarization?

Accepted Answer

A)  P wave. 
B)  QRS complex. 
C)  T wave. 
D)  PR segment. 
E)  ventricular repolarization occurs simultaneously with atrial depolarization and consequently cannot be recorded. 
A)  P wave. 
B)  QRS complex. 
C)  T wave. 
D)  PR segment. 
E)  ventricular repolarization occurs simultaneously with atrial depolarization and consequently cannot be recorded.

Question 9

Catecholamine ____________________ the heart rate.

Accepted Answer

The answer of Catecholamine ____________________ the heart rate....

Question 10

Diastole refers to the period of cardiac relaxation.

Accepted Answer

A) True 
 B)False

Question 11

MATCHING: ART
   
The following questions refer to the accompanying diagram of the heart. Eight structures (vessels or chambers) labels have been removed and replaced with letters A-H. Match the letter with list of missing terms below to complete the diagram.
-inferior vena cava

Accepted Answer

The answer of MATCHING: ART
   
The following questions...

Question 12

Funny channels are found in both non-contractile and contractile cells in the heart.

Accepted Answer

A) True 
 B)False

Question 13

Parasympathetic stimulation slows the rate of depolarization of the SA node and thus decreases the heart rate.

Accepted Answer

A) True 
 B)False

Question 14

Use the answer code below to complete the following statements.
-The two main determinants of cardiac output are _____ and _____.

Accepted Answer

A) stroke volume 
B) end-diastolic volume 
C) cardiac output 
D) heart rate 
E) end-systolic volume
F)sympathetic activity 
A) stroke volume 
B) end-diastolic volume 
C) cardiac output 
D) heart rate 
E) end-systolic volume
F)sympathetic activity

Question 15

The difference between which two numbers on the diagram represents stroke volume?

Accepted Answer

A)  15-7 
B)  7-2 
C)  7-15 
D)  18-21 
A)  15-7 
B)  7-2 
C)  7-15 
D)  18-21

Question 16

Ninety-nine percent of the cardiac fibers are specialized for ____________________, whereas the remainder are specialized for ____________________.

Accepted Answer

contraction, initiat

Question 17

The QRS complex represents

Accepted Answer

A)  depolarization of the atria. 
B)  depolarization of the ventricles. 
C)  the AV nodal delay. 
D)  repolarization of the ventricles. 
E)  the time during which the heart is contracting. 
A)  depolarization of the atria. 
B)  depolarization of the ventricles. 
C)  the AV nodal delay. 
D)  repolarization of the ventricles. 
E)  the time during which the heart is contracting.

Question 18

Although the heart does not require the nervous system to initiate contraction events:

Accepted Answer

A)  it is sympathetically innervated via cardiac nerve fibers. 
B)  it is parasympathetically innervated by vagus nerve fibers. 
C)  it is innervated by the phrenic nerve. 
D)  it is innervated by the sympathetic division of the autonomic nervous system only. 
E)  both (a) and (b) above. 
A)  it is sympathetically innervated via cardiac nerve fibers. 
B)  it is parasympathetically innervated by vagus nerve fibers. 
C)  it is innervated by the phrenic nerve. 
D)  it is innervated by the sympathetic division of the autonomic nervous system only. 
E)  both (a) and (b) above.

Question 19

The electrocardiogram is most useful in determining which component of cardiac output?

Accepted Answer

A)  stroke volume 
B)  heart rate 
C)  ejection fraction 
D)  end-diastolic volume 
E)  murmurs 
A)  stroke volume 
B)  heart rate 
C)  ejection fraction 
D)  end-diastolic volume 
E)  murmurs

Question 20

Select the incorrect statement about cardiac muscle cells.

Accepted Answer

A)  all of them contract in the heart or none of them contract. 
B)  they are capable of graded strength of contraction. 
C)  they are produced constantly after infancy. 
D)  they have an abundance of mitochondria. 
E)  they have an abundance of myoglobin. 
A)  all of them contract in the heart or none of them contract. 
B)  they are capable of graded strength of contraction. 
C)  they are produced constantly after infancy. 
D)  they have an abundance of mitochondria. 
E)  they have an abundance of myoglobin.

The first heart sound

The T wave represents the depolarization of the ventricles.

An increase in parasympathetic activity ____________________ the heart rate.

The cardiac output is equal to

Describe generation of pacemaker action potentials.

When the heart is sympathetically stimulated

Blood returning from the vena cava:

Which of the following ECG waves represents ventricular repolarization?

Catecholamine ____________________ the heart rate.

Diastole refers to the period of cardiac relaxation.

MATCHING: ART The following questions refer to the accompanying diagram of the heart. Eight structures (vessels or chambers) labels have been removed and replaced with letters A-H. Match the letter with list of missing terms below to complete the diagram. -inferior vena cava

Funny channels are found in both non-contractile and contractile cells in the heart.

Parasympathetic stimulation slows the rate of depolarization of the SA node and thus decreases the heart rate.

Use the answer code below to complete the following statements. -The two main determinants of cardiac output are _ and _.

The difference between which two numbers on the diagram represents stroke volume?

Ninety-nine percent of the cardiac fibers are specialized for , whereas the remainder are specialized for .

The QRS complex represents

Although the heart does not require the nervous system to initiate contraction events:

The electrocardiogram is most useful in determining which component of cardiac output?

Select the incorrect statement about cardiac muscle cells.

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division and Special Senses

The Peripheral Nervous System: Efferent Division

Muscle Physiology

The Blood Vessels and Blood Pressure

The Blood and Body Defenses

The Respiratory System

The Urinary System

Fluid and Acid-Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine System

The Reproductive System

Filters

Exam 9: Cardiac Physiology

The first heart sound

The T wave represents the depolarization of the ventricles.

An increase in parasympathetic activity ____________________ the heart rate.

The cardiac output is equal to

Describe generation of pacemaker action potentials.

When the heart is sympathetically stimulated

Blood returning from the vena cava:

Which of the following ECG waves represents ventricular repolarization?

Catecholamine ____________________ the heart rate.

Diastole refers to the period of cardiac relaxation.

MATCHING: ART The following questions refer to the accompanying diagram of the heart. Eight structures (vessels or chambers) labels have been removed and replaced with letters A-H. Match the letter with list of missing terms below to complete the diagram. -inferior vena cava

Funny channels are found in both non-contractile and contractile cells in the heart.

Parasympathetic stimulation slows the rate of depolarization of the SA node and thus decreases the heart rate.

Use the answer code below to complete the following statements. -The two main determinants of cardiac output are _____ and _____.

The difference between which two numbers on the diagram represents stroke volume?

Ninety-nine percent of the cardiac fibers are specialized for ____________________, whereas the remainder are specialized for ____________________.

The QRS complex represents

Although the heart does not require the nervous system to initiate contraction events:

The electrocardiogram is most useful in determining which component of cardiac output?

Select the incorrect statement about cardiac muscle cells.

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division and Special Senses

The Peripheral Nervous System: Efferent Division

Muscle Physiology

The Blood Vessels and Blood Pressure

The Blood and Body Defenses

The Respiratory System

The Urinary System

Fluid and Acid-Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine System

The Reproductive System

Filters

Use the answer code below to complete the following statements. -The two main determinants of cardiac output are _ and _.

Ninety-nine percent of the cardiac fibers are specialized for , whereas the remainder are specialized for .