Deck 2: Electrophysiology

Question 1

The wave or complex that represents ventricular repolarization is the

A)P wave.
B)QRS complex.
C)T wave.
D)U wave.

Answer 1

C

Question 2

What electrical event must occur for atrial kick to occur?

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

Answer 2

A

Question 3

The P wave represents

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

Answer 3

A

Question 4

The PR segment is located between the

A)P wave and the QRS complex.
B)QRS complex and the T wave.
C)T wave and the next P wave.
D)P wave and the T wave.

Question 5

The cardiac cell at rest has what kind of electrical charge?

A)Positive charge
B)Negative charge
C)Neutral charge
D)No charge at all

Question 6

The normal ST segment is

A)At the isoelectric line.
B)Elevated above the isoelectric line.
C)Depressed below the isoelectric line.
D)Both above and below the isoelectric line.

Question 7

Depolarization is a(n)

A)Electrical event that should result in muscle relaxation.
B)Mechanical event that should result in depolarization.
C)Electrical event that should result in muscle contraction.
D)Mechanical event that should result in repolarization.

Question 8

Which of the following ions has a direct effect on the strength of cardiac contraction?

A)Sodium
B)Potassium
C)Magnesium
D)Calcium

Question 9

The T wave represents

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

Question 10

For purposes of determining the presence of ST segment changes,the baseline is considered to be the

A)PT segment.
B)PR segment.
C)TP segment.
D)QT segment.

Question 11

The ST segment is located between the

A)P wave and the QRS complex.
B)QRS complex and the T wave.
C)T wave and the next P wave.
D)P wave and the T wave.

Question 12

In the action potential,phase 0 is

A)Depolarization.
B)Plateau.
C)Rapid repolarization.
D)Rest.

Question 13

Which of the following correctly describes the relative refractory period?

A)It is the period in which even a weak impulse can cause another depolarization.
B)It is the period in which only a strong impulse can cause another depolarization.
C)It is the period in which no impulses at all can cause another depolarization.
D)It is the period in which the heart function stops temporarily to allow impulse transmission to occur.

Question 14

Which of the following is NOT TRUE?

A)Cardiac cells can contract without having been depolarized.
B)Cardiac cells must be depolarized before they can contract.
C)Cardiac contraction occurs as a result of phase 0 of the action potential.
D)Cardiac contraction requires the presence of calcium ions.

Question 15

The QRS complex represents

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

Question 16

The EKG is a recording of the

A)Heart's mechanical activity.
B)Brain's electrical activity.
C)Heart's electrical activity.
D)Heart's electrical and mechanical activity.

Question 17

+20 mV is the

A)Resting transmembrane potential.
B)Transmembrane potential at the conclusion of phase 3 of the action potential.
C)Transmembrane potential at the conclusion of phase 0 of the action potential.
D)Transmembrane potential at the beginning of cardiac rest.

Question 18

In the action potential,phase 3 is

A)Depolarization.
B)Rapid repolarization.
C)Plateau.
D)Rest.

Question 19

The relative refractory period extends from the

A)Beginning of the T wave to the beginning of the next QRS complex.
B)Beginning of the P wave to the beginning of the QRS complex.
C)Beginning of the QRS complex to the upstroke of the T wave.
D)Upstroke of the T wave to the end of the T wave.

Question 20

Phase 0 of the action potential corresponds with what wave or complex on the EKG?

A)T wave
B)QRS complex
C)U wave
D)ST segment

Question 21

The P wave represents atrial depolarization.

Question 22

The normal rate of the sinus node is 60-100 beats per minute.

Question 23

The normal pacemaker of the heart is the

A)Sinus node.
B)AV node.
C)Purkinje fibers.
D)Coronary sinus.

Question 24

The PR segment is a flat line located between the QRS complex and the T wave.

Question 25

Which of these statements about the sinus node is FALSE?

A)It is the normal pacemaker of the heart.
B)It has the fastest inherent rate of all the possible pacemaker sites.
C)It is the slowest pacemaker of the heart.
D)It fires at an inherent rate of 60-100 beats per minute.

Question 26

The PR interval measures the time it takes for the impulse to travel from the

A)AV node to the bundle branches.
B)Bundle of His to the ventricular myocardium.
C)Sinus node to the internodal tracts.
D)Atria to the ventricle.

Question 27

During the absolute refractory period,only a strong stimulus can result in depolarization.

Question 28

Cardiac cell stimulus during the absolute refractory period often results in very fast,dangerous rhythms.

Question 29

The job of the cardiac conduction system is to

A)Propagate electrical impulses.
B)Conduct electrical impulses.
C)Cause depolarization of myocardial cells.
D)All of the above.

Question 30

The baseline is a flat line from which the waves and complexes take off.

Question 31

The PR interval measures the time it takes for the impulse to travel from the atrium down to the ventricle.

Question 32

The normal pacemaker of the heart is the AV node.

Question 33

Contractility is the ability of a cardiac cell to

A)Initiate an impulse without outside stimulus.
B)Pass an impulse along to neighboring cells.
C)Respond to a stimulus by depolarizing.
D)Contract.

Question 34

Which of the following characteristics of heart cells is mechanical?

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

Question 35

The polarized cardiac cell is electrically negative.

Question 36

The ventricle's inherent rate is

A)20-40 beats per minute.
B)40-60 beats per minute.
C)60-80 beats per minute.
D)60-100 beats per minute.

Question 37

An upward deflection of the QRS complex is called a(n)

A)P wave.
B)Q wave.
C)R wave.
D)T wave.

Question 38

The cardiac cell,at rest,has a transmembrane potential of +20 mV.

Question 39

The normal inherent rate of the sinus node as a pacemaker is

A)20-40 beats per minute.
B)40-60 beats per minute.
C)60-80 beats per minute.
D)60-100 beats per minute.

Question 40

After the sinus node initiates an impulse,where does the impulse go next?

A)Interatrial tracts
B)Purkinje fibers
C)Ventricular tissue
D)Bundle branches

Question 41

One small block on the EKG paper measures _____ seconds.

Question 42

Atrial depolarization is represented on the EKG as a _____.

Question 43

The pacemaker with the slowest inherent rate is the _____.

Question 44

Dysrhythmias are _____ heart rhythms.

Question 45

A negative deflection that occurs before a positive one is labeled a _____ wave.

Question 46

Normal conduction begins with the pacemaker of the heart,the _____.

Question 47

Depolarization is the changing of the cardiac cell to an electrically _____ charge.

Question 48

Normal QRS interval is _____ seconds or less than three small blocks.

Question 49

Transmembrane potential is the electrical charge at the _____.

Question 50

Refractory means _____to.