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ECG ch2 Test

Enter the letter for the matching Answer
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1.
This phase represents depolarazition. It is the rapid entry of NA+ into the cell
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2.
The movement of charged particles across a cell membrane causing the inside of the cell to become positive
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3.
The resting membrane potential. During this phase an excess of NA+ is inside and K+ outside the cell. The NA+/K+ pump is activated to move NA+ outside and K+ back into the cell. The heart is polarized during this phase.
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4.
The leads that view the lateral surface of the heart
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5.
It represents activation of the AV node, the bundle of His, the bundle branches and the Purkinje fibers
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6.
Each electrode placed in the V position is a
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7.
Several waveforms
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8.
This medication will increase the heart rate and force of contraction
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9.
The leads that view the anterior surface of the heart
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10.
When the inside of a cell is more negative then the outside
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11.
The stimulus that alters the electrical charges across the cell membrane may be electrical mechanical or ?
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12.
The ability of cardiac muscle cells to respond to an outside stimulus
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13.
Phase 4 is referred to as
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14.
In leads I and II the right arm is
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15.
Elements or compounds such as NA+ K+ CA+ and CL- that break into charged particles (ions) when melted or dissolved in water or other solvent
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16.
Part of the conduction system that reseives an impulse from the SA node but delays relaying that impulse to the bundle of His, allowing time for the atria to empty their contents into the venticles before the onset of ventricular contraction
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17.
The portion of the ECG tracing used to determine the degree of ST segment displacement
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18.
The spread of an impulse through tissue already stimulated by that same impulse
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19.
A line between waveforms is called
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20.
The PR interval is considered prolonged if it is more then
A.
Excitability
B.
Complex
C.
Polarized state
D.
Reentry
E.
Negative
F.
Electrolytes
G.
Depolarization
H.
TP or PR segment
I.
V3 and V4
J.
Chemical
K.
Phase 0
L.
Epinephrine
M.
.20 secs
N.
Electrical diastole
O.
Phase 4
P.
I, aVL, V5, and V6
Q.
Positive electrode
R.
AV Node
S.
Segment
T.
PR segment
Type the Answer that corresponds to the displayed Question.
incorrect
21.
Distortion of an ECG tracing by electrical activity that is noncardiac in origin is called
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22.
Also called irritability referes to the ability of cardiac muscle cells to respond to an outside stimulus
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23.
The ability of a membrane channel to allow passage of electtolytes once it is open
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24.
During this phase the NA+ channels partially close, slowing the flow of NA+ into the cell. At the same time CL- enters and K+ leaves. Resulting in a decrease in the # of positive electrical charges within the cell
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25.
After the relative refractory period, a weaker then normal stimulus can cause cardiac cells to depolarize during this period. It extends from the end pf phase 3 to the beginning of phase 4
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26.
The primary pacemaker
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27.
The a in aVR, aVL and aVF
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28.
The spread of an impulse through tissue already stimulated
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29.
On the ECG the time necessary fot the spread of an electrical impulse through the AV nodes, bundle of His, right and left bundle branches and the purkinje fibers is represented by the
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30.
The measurement of potential energy is

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