EP

Question 1

____ state of a cardiac cell

Answer 1

Resting

Question 2

_____ _____ of a cardiac cell

Answer 2

Early depolarization

Question 3

_____ ______ in a cardiac cell

Answer 3

Depolarization complete

Question 4

____ ______ in a cardiac cell

Answer 4

Early repolarization

Question 5

Myocardial cells consist of contractile protein filaments called

Answer 5

Actin and myosin

Question 6

Automaticity

Answer 6

The ability of the pacemaker cells to generate their own electrical impulses spontaneously
Specific to pacemaker cells (not myocardial)

Question 7

Excitability

Answer 7

The ability of cardiac cells to respond to an impulse
All cardiac cells

Question 8

Conductivity

Answer 8

The ability of cardiac cells to receive an electrical impulse and transmit it to other cardiac cells
All cardiac cells

Question 9

Contractility

Answer 9

The ability of the myocardial cells to shorten and cause muscle contraction
Specific to myocardial cells (not pacemakers cells)

Question 10

Primary intracellular ion

Answer 10

Potassium (K+)

Question 11

Primary extracellular ion

Answer 11

Sodium (Na+)

Question 12

In the resting cardiac cell, the inside of the cell is more ____ than outside

Answer 12

Negative

Question 13

The depolarization process proceeds from the ______ layer to the ______ layer of the heart

Answer 13

Innermost to outermost

Question 14

The repolarization process proceeds from the _____ layer to the _____ layer of the heart

Answer 14

Outermost to innermost

Question 15

SA Node Rate

Answer 15

60-100 bpm

Question 16

AV Node Rate

Answer 16

40-60 bpm
Secondary pacemaker

Question 17

Ventricular pacemaker cell rate

Answer 17

30-40 bpm

Question 18

How many intranodal tracts are located in the RA?

Answer 18

3

Question 19

Interatrial tract conducting impulses from the SA node to the LA

Answer 19

Bachmann’s bundle

Question 20

Period in which cardiac cells cannot respond to a stimulus no matter the strength

Answer 20

Absolute refractory period

Question 21

Absolute refractory period on ECG tracing

Answer 21

Onset of the QRS complex to the peak of the T wave

Question 22

Period in which cardiac cells have the potential to respond to a stronger than normal stimulus

Answer 22

Relative refractory period
AKA the vulnerable period of repolarization

Question 23

Relative refractory period on an ECG tracing

Answer 23

Peak of the T wave to the end of the T wave

Question 24

Why is the relative refractory period also referred to as the vulnerable period of repolarization

Answer 24

Cardiac cells could respond to a stronger than stimulus which could usurp the primary pacemaker of the heart

Question 25

Period in which cardiac cells will respond to a weaker than normal stimulus

Answer 25

Supernormal period
Near the end of the T wave