Question 1

What is the term for the ability of the heart cells to transmit electrical current from cell to cell?

Accepted Answer

A)  conductivity 
B)  contractility 
C)  automaticity 
D)  irritability 
A)  conductivity 
B)  contractility 
C)  automaticity 
D)  irritability A

Question 2

Which phase of the action potential prolongs the contraction of the myocardial cells?

Accepted Answer

A)  Phase 2 
B)  Phase 3 
C)  Phase 4 
D)  Phase 5 
A)  Phase 2 
B)  Phase 3 
C)  Phase 4 
D)  Phase 5 A

Question 3

What is the basic term for the phase in which the heart is not generating an action potential?

Accepted Answer

A)  polarized 
B)  depolarized 
C)  contractile 
D)  conductive 
A)  polarized 
B)  depolarized 
C)  contractile 
D)  conductive A

Question 4

What is the term for the time in which cells cannot respond to a stimulus?

Accepted Answer

A)  absolute refractory period 
B)  relative refractory period 
C)  nonrefractory period 
D)  partial resistance period 
A)  absolute refractory period 
B)  relative refractory period 
C)  nonrefractory period 
D)  partial resistance period

Question 5

Approximately what percentage of the heart is composed of autorhythmic cells?

Accepted Answer

A)  1% 
B)  12% 
C)  18% 
D)  24% 
A)  1% 
B)  12% 
C)  18% 
D)  24%

Question 6

At what point do the internodal tracts of the right atrium merge?

Accepted Answer

A)  AV junction 
B)  SA junction 
C)  Bachmann's bundle 
D)  Purkinje fibers 
A)  AV junction 
B)  SA junction 
C)  Bachmann's bundle 
D)  Purkinje fibers

Question 7

What does the RMP of the myocardial cells equal?

Accepted Answer

A)  -90 mV 
B)  -50 mV 
C)  -30 mV 
D)  -15 mV 
A)  -90 mV 
B)  -50 mV 
C)  -30 mV 
D)  -15 mV

Question 8

Which phases of the action potential represent the absolute refractory period?
I.Phase 0
II.Phase 1
III.Phase 2
IV.First half of Phase 3
V.First half of Phase 4

Accepted Answer

A)  I, II, III, and IV only 
B)  I, II, and III only 
C)  IV and V only 
D)  II, III, and IV only 
A)  I, II, III, and IV only 
B)  I, II, and III only 
C)  IV and V only 
D)  II, III, and IV only

Question 9

At the end of Phase 0,what does the voltage inside the myocardial cell equal?

Accepted Answer

A)  +30 mV 
B)  +15 mV 
C)  -30 mV 
D)  -90 mV 
A)  +30 mV 
B)  +15 mV 
C)  -30 mV 
D)  -90 mV

Question 10

What are the three promary electrolytes responsible for the electrical difference across the resting membrane potential?

Accepted Answer

A)  potassium, sodium, and calcium 
B)  potassium sodiun, and chloride 
C)  sodium, chloride, and bicarbonate 
D)  sodium, chloride, and potassium 
A)  potassium, sodium, and calcium 
B)  potassium sodiun, and chloride 
C)  sodium, chloride, and bicarbonate 
D)  sodium, chloride, and potassium

Question 11

What is the term for the ability of cardiac muscle fibers to shorten in response to an electrical stimulus?

Accepted Answer

A)  contractility 
B)  conductivity 
C)  automaticity 
D)  excitability 
A)  contractility 
B)  conductivity 
C)  automaticity 
D)  excitability

Question 12

Which phase of the action potential represents the relative refractory period?

Accepted Answer

A)  Last half of Phase 3 
B)  First half of Phase 3 
C)  Last half of Phase 4 
D)  First half of Phase 4 
A)  Last half of Phase 3 
B)  First half of Phase 3 
C)  Last half of Phase 4 
D)  First half of Phase 4

Question 13

Which phase of the action potential represents the nonrefractory period?

Accepted Answer

A)  Phase 4 
B)  last half of Phase 3 
C)  first half of Phase 3 
D)  Phase 5 
A)  Phase 4 
B)  last half of Phase 3 
C)  first half of Phase 3 
D)  Phase 5

Question 14

Of the phases of the action potential, which phase represents rapid depolarization of the myocardial cells?

Accepted Answer

A)  Phase 0 
B)  Phase 1 
C)  Phase 4 
D)  Phase 5 
A)  Phase 0 
B)  Phase 1 
C)  Phase 4 
D)  Phase 5

Question 15

Which structure transmits the electrical impulse from the SA node to the left atrium?

Accepted Answer

A)  Bachmann's bundle 
B)  AV junction 
C)  bundle of His 
D)  Purkinje fibers 
A)  Bachmann's bundle 
B)  AV junction 
C)  bundle of His 
D)  Purkinje fibers

Question 16

What effect will stimulation of sympathetic neural fibers have on heart rate and excitability?

Accepted Answer

A)  both will be increased 
B)  both will be decreased 
C)  heart rate will increase and excitability will decrease 
D)  heart rate will increase and excitability will be unaffected 
A)  both will be increased 
B)  both will be decreased 
C)  heart rate will increase and excitability will decrease 
D)  heart rate will increase and excitability will be unaffected

Question 17

Which phase of the action potential represents initial repolarization of hte myocardial cells?

Accepted Answer

A)  Phase 1 
B)  Phase 2 
C)  Phase 3 
D)  Phase 0 
A)  Phase 1 
B)  Phase 2 
C)  Phase 3 
D)  Phase 0

Question 18

What is the term for the electrical currents that travel across the cell membranes of the heart?

Accepted Answer

A)  action potential 
B)  nerve impulse 
C)  stimulus 
D)  conduction 
A)  action potential 
B)  nerve impulse 
C)  stimulus 
D)  conduction

Question 19

During which phase of the action potential do the voltage-sensitive ion channels return to their pre-depolarization permeability?

Accepted Answer

A)  Phase 4 
B)  Phase 3 
C)  Phase 5 
D)  Phase 0 
A)  Phase 4 
B)  Phase 3 
C)  Phase 5 
D)  Phase 0

Question 20

Which portion of the conductive system is considered to be the pacemaker of the heart?

Accepted Answer

A)  sinoatrial node 
B)  sinoarterial node 
C)  atrioventricular node 
D)  arteriovalvular node 
A)  sinoatrial node 
B)  sinoarterial node 
C)  atrioventricular node 
D)  arteriovalvular node

What is the term for the ability of the heart cells to transmit electrical current from cell to cell?

Which phase of the action potential prolongs the contraction of the myocardial cells?

What is the basic term for the phase in which the heart is not generating an action potential?

What is the term for the time in which cells cannot respond to a stimulus?

Approximately what percentage of the heart is composed of autorhythmic cells?

At what point do the internodal tracts of the right atrium merge?

What does the RMP of the myocardial cells equal?

Which phases of the action potential represent the absolute refractory period? I.Phase 0 II.Phase 1 III.Phase 2 IV.First half of Phase 3 V.First half of Phase 4

At the end of Phase 0,what does the voltage inside the myocardial cell equal?

What are the three promary electrolytes responsible for the electrical difference across the resting membrane potential?

What is the term for the ability of cardiac muscle fibers to shorten in response to an electrical stimulus?

Which phase of the action potential represents the relative refractory period?

Which phase of the action potential represents the nonrefractory period?

Of the phases of the action potential, which phase represents rapid depolarization of the myocardial cells?

Which structure transmits the electrical impulse from the SA node to the left atrium?

What effect will stimulation of sympathetic neural fibers have on heart rate and excitability?

Which phase of the action potential represents initial repolarization of hte myocardial cells?

What is the term for the electrical currents that travel across the cell membranes of the heart?

During which phase of the action potential do the voltage-sensitive ion channels return to their pre-depolarization permeability?

Which portion of the conductive system is considered to be the pacemaker of the heart?

The Anatomy and Physiology of the Respiratory System

Ventilation

Pulmonary Function Measurements

The Diffusion of Pulmonary Gases

The Anatomy and Physiology of the Circulatory System

Oxygen and Carbon DioxideTransport

Acid Base Balance

Ventilation Perfusion Relationships

Control of Ventilation

Fetal Development and the Cardiopulmonary System

Aging and the Cardiopulmonary System

The Standard 12 ECG System

ECG Interpretation

Hemodynamic Measurements

Renal Failure and Its Effects on the Cardiopulmonary System

Sleep Physiology and Its Relationship to the Cardiopulmonary System

Exercise and Its Effects on the Cardiopulmonary System

High Altitude and Its Effects on the Cardiopulmonary System

High Pressure Environments and Their Effects on the Cardiopulmonary System

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Exam 12: Electrophysiology of the Heart

What is the term for the ability of the heart cells to transmit electrical current from cell to cell?

Which phase of the action potential prolongs the contraction of the myocardial cells?

What is the basic term for the phase in which the heart is not generating an action potential?

What is the term for the time in which cells cannot respond to a stimulus?

Approximately what percentage of the heart is composed of autorhythmic cells?

At what point do the internodal tracts of the right atrium merge?

What does the RMP of the myocardial cells equal?

Which phases of the action potential represent the absolute refractory period? I.Phase 0 II.Phase 1 III.Phase 2 IV.First half of Phase 3 V.First half of Phase 4

At the end of Phase 0,what does the voltage inside the myocardial cell equal?

What are the three promary electrolytes responsible for the electrical difference across the resting membrane potential?

What is the term for the ability of cardiac muscle fibers to shorten in response to an electrical stimulus?

Which phase of the action potential represents the relative refractory period?

Which phase of the action potential represents the nonrefractory period?

Of the phases of the action potential, which phase represents rapid depolarization of the myocardial cells?

Which structure transmits the electrical impulse from the SA node to the left atrium?

What effect will stimulation of sympathetic neural fibers have on heart rate and excitability?

Which phase of the action potential represents initial repolarization of hte myocardial cells?

What is the term for the electrical currents that travel across the cell membranes of the heart?

During which phase of the action potential do the voltage-sensitive ion channels return to their pre-depolarization permeability?

Which portion of the conductive system is considered to be the pacemaker of the heart?

The Anatomy and Physiology of the Respiratory System

Ventilation

Pulmonary Function Measurements

The Diffusion of Pulmonary Gases

The Anatomy and Physiology of the Circulatory System

Oxygen and Carbon DioxideTransport

Acid Base Balance

Ventilation Perfusion Relationships

Control of Ventilation

Fetal Development and the Cardiopulmonary System

Aging and the Cardiopulmonary System

The Standard 12 ECG System

ECG Interpretation

Hemodynamic Measurements

Renal Failure and Its Effects on the Cardiopulmonary System

Sleep Physiology and Its Relationship to the Cardiopulmonary System

Exercise and Its Effects on the Cardiopulmonary System

High Altitude and Its Effects on the Cardiopulmonary System

High Pressure Environments and Their Effects on the Cardiopulmonary System

Filters