Question 1

In the normal heart, the has the highest rate of discharge and sets the rate of depolarization for the heart as a whole.

Accepted Answer

A)  bundle branches 
B)  AV bundle 
C)  AV node 
D)  SA node 
A)  bundle branches 
B)  AV bundle 
C)  AV node 
D)  SA node D

Question 2

How does holding the breath affect heart rate?

Accepted Answer

A)  heart rate increases 
B)  heart rate decreases 
C)  heart rate is unaffected by breath holding 
A)  heart rate increases 
B)  heart rate decreases 
C)  heart rate is unaffected by breath holding B

Question 3

The function of the intrinsic conduction system is to .

Accepted Answer

A)  ensure that the heart beats in a sequential and coordinated manner 
B)  carry branches of the autonomic nervous system to heart muscle 
C)  maintain the structural integrity of the atria and ventricles 
D)  contract slightly before the cardiac tissue to which it is connected 
A)  ensure that the heart beats in a sequential and coordinated manner 
B)  carry branches of the autonomic nervous system to heart muscle 
C)  maintain the structural integrity of the atria and ventricles 
D)  contract slightly before the cardiac tissue to which it is connected A

Question 4

The QRS complex is associated with .

Accepted Answer

A)  repolarization of the ventricles 
B)  depolarization of the atria 
C)  depolarization of the ventricles 
D)  depolarization of the ventricular septum 
A)  repolarization of the ventricles 
B)  depolarization of the atria 
C)  depolarization of the ventricles 
D)  depolarization of the ventricular septum

Question 5

A normal Q-T interval is .

Accepted Answer

A)  0.08 sec when the heart rate is 50 beats/min 
B)  0.16-0.18 sec when the heart rate is 60 beats/min 
C)  0.32-0.38 sec when heart rate is 70 beats/min 
D)  1.0-2.0 sec when heart rate is 80 beats/min 
A)  0.08 sec when the heart rate is 50 beats/min 
B)  0.16-0.18 sec when the heart rate is 60 beats/min 
C)  0.32-0.38 sec when heart rate is 70 beats/min 
D)  1.0-2.0 sec when heart rate is 80 beats/min

Question 6

The middle and largest deflection wave in a normal ECG is the .

Accepted Answer

A)  T wave 
B)  QRS complex 
C)  P wave 
A)  T wave 
B)  QRS complex 
C)  P wave

Question 7

The P wave of the ECG represents .

Accepted Answer

A)  depolarization of the atria 
B)  depolarization of the ventricles 
C)  repolarization of the atria 
D)  repolarization of the ventricles 
A)  depolarization of the atria 
B)  depolarization of the ventricles 
C)  repolarization of the atria 
D)  repolarization of the ventricles

Question 8

In sequential order, the components of the intrinsic conduction system, beginning at the SA node, are .

Accepted Answer

A)  AV node, AV bundle, bundle branches, subendocardial conducting network (Purkinje fibers) 
B)  bundle branches, AV node, AV bundle, subendocardial conducting network (Purkinje fibers) 
C)  subendocardial conducting network (Purkinje fibers), bundle branches, AV bundle, AV node 
D)  AV bundle, AV node, subendocardial conducting network (Purkinje fibers), bundle branches 
A)  AV node, AV bundle, bundle branches, subendocardial conducting network (Purkinje fibers) 
B)  bundle branches, AV node, AV bundle, subendocardial conducting network (Purkinje fibers) 
C)  subendocardial conducting network (Purkinje fibers), bundle branches, AV bundle, AV node 
D)  AV bundle, AV node, subendocardial conducting network (Purkinje fibers), bundle branches

Question 9

The electrocardiogram (ECG) shows a record of .

Accepted Answer

A)  electrical activity of the heart muscle 
B)  each heart beat (or contraction) 
C)  the electrical events in the intrinsic conduction system 
A)  electrical activity of the heart muscle 
B)  each heart beat (or contraction) 
C)  the electrical events in the intrinsic conduction system

Question 10

A health care provider who suspects that a patient is having a heart attack will look very carefully at this portion of the ECG.

Accepted Answer

A)  S-T segment 
B)  P-R interval 
C)  QRS complex 
D)  Q-T interval 
A)  S-T segment 
B)  P-R interval 
C)  QRS complex 
D)  Q-T interval

Question 11

Ventricular fibrillation is .

Accepted Answer

A)  fluttering of the atria 
B)  slow, strong ventricular contractions 
C)  strong, rhythmic atrial contractions 
D)  rapid, uncoordinated ventricular contractions 
A)  fluttering of the atria 
B)  slow, strong ventricular contractions 
C)  strong, rhythmic atrial contractions 
D)  rapid, uncoordinated ventricular contractions

Question 12

If the AV node is damaged so that it can no longer transmit the signal from the SA node (total heart block), will the ventricles continue to contract? Why or why not?

Accepted Answer

A)  No: there are no cells left to pace and coordinate the heart beat. 
B)  Yes: the AV bundle will keep the heart going at the usual rate. 
C)  Yes: however, ventricular contractions will no longer follow atrial contractions, and the rate of ventricular contractions will be significantly slowed. 
D)  No: the SA node must be intact to pace the system. 
A)  No: there are no cells left to pace and coordinate the heart beat. 
B)  Yes: the AV bundle will keep the heart going at the usual rate. 
C)  Yes: however, ventricular contractions will no longer follow atrial contractions, and the rate of ventricular contractions will be significantly slowed. 
D)  No: the SA node must be intact to pace the system.

Question 13

This portion of the ECG is associated with ventricular contraction.

Accepted Answer

A)  Q-T interval 
B)  P-R interval 
C)  QRS complex 
D)  S-T segment 
A)  Q-T interval 
B)  P-R interval 
C)  QRS complex 
D)  S-T segment

Question 14

The T wave of the ECG represents _.

Accepted Answer

A)  repolarization of the ventricles 
B)  depolarization of the ventricles 
C)  repolarization of the atria 
D)  depolarization of the atria 
A)  repolarization of the ventricles 
B)  depolarization of the ventricles 
C)  repolarization of the atria 
D)  depolarization of the atria

Question 15

It the interval between R waves is on an ECG is 0.80 sec, then the heart rate is .

Accepted Answer

A)  70 beats/min 
B)  80 beats/min 
C)  65 beats/min 
D)  75 beats/min 
A)  70 beats/min 
B)  80 beats/min 
C)  65 beats/min 
D)  75 beats/min

Question 16

Bradycardia describes a heart rate of _.

Accepted Answer

A)  over 100 beats/min 
B)  60-80 beats/min 
C)  80-100 beats/min 
D)  less than 60 beats/min 
A)  over 100 beats/min 
B)  60-80 beats/min 
C)  80-100 beats/min 
D)  less than 60 beats/min

Question 17

Atrial fibrillation is .

Accepted Answer

A)  slow, strong ventricular contractions 
B)  strong, rhythmic atrial contractions 
C)  rapid, uncoordinated ventricular contractions 
D)  uncoordinated beating of the atria 
A)  slow, strong ventricular contractions 
B)  strong, rhythmic atrial contractions 
C)  rapid, uncoordinated ventricular contractions 
D)  uncoordinated beating of the atria

Question 18

During exercise, the heart rate .

Accepted Answer

A)  decreases slightly, but the contractions are stronger 
B)  increases proportional to the exertion involved 
C)  increases to a set "exercise rate" 
D)  decreases in inverse relation to the exertion involved 
A)  decreases slightly, but the contractions are stronger 
B)  increases proportional to the exertion involved 
C)  increases to a set "exercise rate" 
D)  decreases in inverse relation to the exertion involved

Exam 31: Conduction System of the Heart and Electrocardiography

In the normal heart, the has the highest rate of discharge and sets the rate of depolarization for the heart as a whole.

How does holding the breath affect heart rate?

The function of the intrinsic conduction system is to .

The QRS complex is associated with .

A normal Q-T interval is .

The middle and largest deflection wave in a normal ECG is the .

The P wave of the ECG represents .

In sequential order, the components of the intrinsic conduction system, beginning at the SA node, are .

The electrocardiogram (ECG) shows a record of .

A health care provider who suspects that a patient is having a heart attack will look very carefully at this portion of the ECG.

Ventricular fibrillation is .

If the AV node is damaged so that it can no longer transmit the signal from the SA node (total heart block), will the ventricles continue to contract? Why or why not?

This portion of the ECG is associated with ventricular contraction.

The T wave of the ECG represents _.

It the interval between R waves is on an ECG is 0.80 sec, then the heart rate is .

Bradycardia describes a heart rate of _.

Atrial fibrillation is .

During exercise, the heart rate .

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