Question 1

The normal pacemaker of the heart is the _____ node,which is found in the _____ atrium,and has an intrinsic firing rate of _____ beats/min.

Accepted Answer

A)  sinoatrial; left; 40 to 60 
B)  sinoatrial; right; 60 to 100 
C)  atrioventricular; left; 20 to 40 
D)  atrioventricular; right; 100 to 180

Question 2

The intrinsic rate of the SA node is _____ beats/min.

Accepted Answer

A)  40 to 60 
B)  60 to 100 
C)  100 to 180 
D)  200 to 260

Question 3

In most ECG leads,a normal Q wave is less than 0.04 seconds in duration and less than one third the amplitude of the R wave in that lead.

Accepted Answer

A) True 
 B)False

Question 4

_____ is a term used to describe the period of recovery that cells need after being discharged before they are able to respond to a stimulus.

Accepted Answer

A)  Irritability 
B)  Conductivity 
C)  Polarization 
D)  Refractoriness

Question 5

On the ECG,the time necessary for the spread of an electrical impulse through the AV node,bundle of His,right and left bundle branches,and the Purkinje fibers is reflected by the _____.

Accepted Answer

A)  TP segment 
B)  PR segment 
C)  QT interval 
D)  QRS duration

Question 6

Explain the significance of Einthoven's triangle.

Accepted Answer

The answer of Explain the significance of Einthoven's triangle....

Question 7

The intrinsic rate of the Purkinje fibers is _____ beats/min.

Accepted Answer

A)  20 to 40 
B)  40 to 60 
C)  60 to 100 
D)  100 to 180

Question 8

Leads I,aVL,V5,and V6 view the _____ surface of the left ventricle.

Accepted Answer

A)  anterior 
B)  septal 
C)  inferior 
D)  lateral

Question 9

In an adult,the normal duration of the QRS complex is _____.

Accepted Answer

A)  0.12 to 0.20 seconds 
B)  0.10 seconds or less 
C)  0.04 to 0.14 seconds 
D)  0.20 seconds or less

Question 10

A conduction problem above the level of the bundle branches will largely affect the P wave and PR interval.

Accepted Answer

A) True 
 B)False

Question 11

What does the QRS complex represent?

Accepted Answer

A)  Atrial depolarization 
B)  Ventricular contraction 
C)  Ventricular repolarization 
D)  Ventricular depolarization

Question 12

An ECG lead that has a positive and negative electrode is called a(n)_____ lead.

Accepted Answer

The answer of An ECG lead that has a positive...

Question 13

List three causes of artifact on an ECG tracing.

Accepted Answer

The answer of List three causes of artifact on an...

Question 14

In the limb leads,the ST segment is normally isoelectric,or less than 1 mm above or below the isoelectric line.

Accepted Answer

A) True 
 B)False

Question 15

The point where the QRS complex and the ST segment meet is called the ST junction or J-point.

Accepted Answer

A) True 
 B)False

Question 16

MATCHING
-ECG changes observed in leads opposite the affected area of the heart; also called mirror image changes

Accepted Answer

A) Electrolyte 
B) Voltmeter 
C) Chemical 
D) Ectopic 
E) Reciprocal changes
F)Atrial
G)Indicative changes
H)Amplitude
I)Repolarization
J)Supranormal
K)Ventricular
L)Reentry
M)Positive
N)Augmented

Question 17

_____ is the ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse without being stimulated from another source,such as a nerve.

Accepted Answer

A)  Excitability 
B)  Conductivity 
C)  Automaticity 
D)  Contractility

Question 18

The period of time during the cardiac cycle when cells cannot respond to a stimulus,no matter how strong,is the relative refractory period.

Accepted Answer

A) True 
 B)False

Question 19

_____ cells are working cells of the heart that contain contractile filaments and form the muscular layer of the atrial walls and the thicker muscular layer of the ventricular walls.

Accepted Answer

A)  Pacemaker 
B)  Myocardial 
C)  Specialized 
D)  Electrical

Question 20

The PR interval is considered prolonged if it is more than _____ seconds in duration.

Accepted Answer

A)  0.06 
B)  0.12 
C)  0.18 
D)  0.20

Exam 2: Basic Electrophysiology

The normal pacemaker of the heart is the ___ node,which is found in the _ atrium,and has an intrinsic firing rate of ___ beats/min.

The intrinsic rate of the SA node is _____ beats/min.

In most ECG leads,a normal Q wave is less than 0.04 seconds in duration and less than one third the amplitude of the R wave in that lead.

_____ is a term used to describe the period of recovery that cells need after being discharged before they are able to respond to a stimulus.

On the ECG,the time necessary for the spread of an electrical impulse through the AV node,bundle of His,right and left bundle branches,and the Purkinje fibers is reflected by the _____.

Explain the significance of Einthoven's triangle.

The intrinsic rate of the Purkinje fibers is _____ beats/min.

Leads I,aVL,V5,and V6 view the _____ surface of the left ventricle.

In an adult,the normal duration of the QRS complex is _____.

A conduction problem above the level of the bundle branches will largely affect the P wave and PR interval.

What does the QRS complex represent?

An ECG lead that has a positive and negative electrode is called a(n)_____ lead.

List three causes of artifact on an ECG tracing.

In the limb leads,the ST segment is normally isoelectric,or less than 1 mm above or below the isoelectric line.

The point where the QRS complex and the ST segment meet is called the ST junction or J-point.

MATCHING -ECG changes observed in leads opposite the affected area of the heart; also called mirror image changes

_____ is the ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse without being stimulated from another source,such as a nerve.

The period of time during the cardiac cycle when cells cannot respond to a stimulus,no matter how strong,is the relative refractory period.

_____ cells are working cells of the heart that contain contractile filaments and form the muscular layer of the atrial walls and the thicker muscular layer of the ventricular walls.

The PR interval is considered prolonged if it is more than _____ seconds in duration.