Question 1

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

Accepted Answer

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

Question 2

In a healthy adult at rest, approximately how much time is required for the entire heart to depolarize?

Accepted Answer

A)  0.002 seconds 
B)  0.02 seconds 
C)  2.2 seconds 
D)  0.22 seconds 
A)  0.002 seconds 
B)  0.02 seconds 
C)  2.2 seconds 
D)  0.22 seconds

Question 3

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

Accepted Answer

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

Question 4

Where does the electrical impulse travel after leaving the AV bundle?

Accepted Answer

A)  Purkinje fibers 
B)  bundle of His 
C)  SA node 
D)  left and right bundle branches 
A)  Purkinje fibers 
B)  bundle of His 
C)  SA node 
D)  left and right bundle branches

Question 5

What is another term for "pacemaker cells"?

Accepted Answer

A)  autorhythmic cells 
B)  sympathetic neural fibers 
C)  contractile muscle fibers 
D)  atrial muscle fibers 
A)  autorhythmic cells 
B)  sympathetic neural fibers 
C)  contractile muscle fibers 
D)  atrial muscle fibers

Question 6

What is the term for the ability of a cell to reach its threshold potential and respond to a stimulus?

Accepted Answer

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

Question 7

Which phase of the action potential represents the nonrefractory period?

Accepted Answer

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

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

In a healthy adult at rest, approximately how much time is required for the entire heart to depolarize?

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

Where does the electrical impulse travel after leaving the AV bundle?

What is another term for "pacemaker cells"?

What is the term for the ability of a cell to reach its threshold potential and respond to a stimulus?

Which phase of the action potential represents the nonrefractory period?

The Anatomy and Physiology of the Respitory System

Ventilation

Pulmonary Function Measurements

The Diffusion of Pulmonary Gases

The Anatomy and Physiology of the Circulatory System

Oxygen and Carbon Dioxide Transport

Acid-Base Balance and Regulation

Ventilation-Perfusion Relationships

Control of Ventilation

Fetal Development and the Cardiopulmonary System

Aging and the Cardiopulmonary System

The Standard 12-Ecg Lead 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

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

In a healthy adult at rest, approximately how much time is required for the entire heart to depolarize?

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

Where does the electrical impulse travel after leaving the AV bundle?

What is another term for "pacemaker cells"?

What is the term for the ability of a cell to reach its threshold potential and respond to a stimulus?

Which phase of the action potential represents the nonrefractory period?

The Anatomy and Physiology of the Respitory System

Ventilation

Pulmonary Function Measurements

The Diffusion of Pulmonary Gases

The Anatomy and Physiology of the Circulatory System

Oxygen and Carbon Dioxide Transport

Acid-Base Balance and Regulation

Ventilation-Perfusion Relationships

Control of Ventilation

Fetal Development and the Cardiopulmonary System

Aging and the Cardiopulmonary System

The Standard 12-Ecg Lead 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