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Understanding EKGs-3 Test

Enter the letter for the matching Answer
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1.
Which is faster, depolarization or repolarization?
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2.
What characteristic of cardiac cells form synctium, because they function collectively as a unit?
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3.
When there is more than one unit, what is the correct term to describe synctium?
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4.
What are the specialized pacemaker cells (aka specialized group) responsible for?
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5.
What is an ion with a positive (+)charge?
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6.
Pertaining to cardiac cells, what are the electrical functions of the heart?
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7.
What intrinsic spontaneous depolarization frequency produces contraction of myocardial muscle cells?
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8.
Why are both mechanical and electrical cardiac function influenced by electrolyte imbalances?
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9.
Where is the relative refractory period shown on the EKG strip?
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10.
Which characteristic of cardiac cells is automatic and mechanical?
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11.
What is required to produce the physical contraction in a heart?
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12.
What are the primary functions of the specialized myocardial pacemaker cells?
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13.
What happens to the size of the atria and ventricles when the myocardial tissue contracts and blood is ejected from the chambers?
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14.
What are the two myocardial cell groups?
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15.
How are the myocardial working cells and specialized pacemaker cells different?
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16.
What is the refactory period of the ventricle muscle?
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17.
What are the three intracellular (inside the cell) cations?
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18.
What are the functions of myocardial working cells?
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19.
True or False: Cardiac muscle tissue has a refractory period to ensure that the muscle is totally relaxed before another action potential or depolarization can be initiated.
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20.
What are the walls of the atria and ventricles constructed of?
A.
Depolarization
B.
1. contraction 2. relaxation
C.
1.Potassium (K) 2.Magnesium (Mg) 3.Calcium (Ca)
D.
Syncytia
E.
Because myocardial cells are bathed in electrolyte solutions.
F.
Myocardial working cells
G.
Myocardial cell groups: 1. The myocardial working cells 2. The specialized pacemaker cells of the electrical conduction system
H.
Automaticity
I.
Contractility
J.
Conductivity
K.
The generation and conduction of electrical impulses
L.
The downslope of the T wave
M.
Approximately .25 - .3 seconds
N.
1.Automaticity 2.Excitability 3.Conductivity
O.
TRUE
P.
Organized electrical activity
Q.
The specialized pacemaker cells DO NOT contain contractile filaments & DO NOT have the ability to contract.
R.
Controlling the rate & rythm of the heart by coordinating regular depolarization.
S.
The size of the atria and ventrical decreases
T.
cation (pronounced kation)
Type the Answer that corresponds to the displayed Question.
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21.
An increase in sodium blood levels is known as:
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22.
What is this brief resting period of the cardiac cells?
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23.
What is the ability of cardiac cells to shorten and cause cardiac muscle contraction in response to an electrical stimulus?
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24.
What characteristic is specific to the pacemaker cell sites of the electrical conduction system (i.e., the SA node, AV junction, and the Purkinje network fibers)?
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25.
Which rate of contractions are potentially faster, ventricles or atria?
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26.
What is the coordination of cardiac muscle cells to produce a regular heartbeat?
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27.
What is the charge of the inside of a cardiac cell during the polarized or resting state?
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28.
What is the extracellular (outside the cell)cation?
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29.
What is the ability of cardiac cells to receive an electrical stimulus and then transmit it to other cardiac cells?
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30.
What is the fourth cation?

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