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ECG ORIENTATION KAISER EXAM QUESIONS AND ANSWERS
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ECG ORIENTATION KAISER EXAM QUESIONS AND ANSWERS
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ECG ORIENTATION KAISER EXAMQUESIONS AND ANSWERS
DEPOLARIZATION - Answer-Movement of ions (Na+, Ca+, K+) across cell membrane
causing inside of cell to become more positive, electrical conduction results in
contraction. Na+ channels open. Positive inside, negative outside.
REPOLARIZATION - Answer-movement of ions across cell membrane where inside of
cell is restored to its negative charge. Sodium channels close. Potassium channels
open. Active transport by sodium-potassium pump
DEPORIZATION - Answer-ELECTRICAL
CONTRACTION - Answer-is mechanical. contraction follows depolarization.
What occur first? electrical conduction, or mechanical contraction? - Answer-
ELECTRICAL CONDUCTION
P WAVE - Answer-atrial depolarization
QRS - Answer-ventrical depolarization
T WAVE - Answer-ventricular repolarization
REFRACTORY PERIOD - Answer-the period of resistance to stimulation, cardiac cells
unable to respond to stimulus
relative refractory period - Answer-cardiac cells have repolarized enough to respond to
strong stimulus
automaticity - Answer- Ability of pacemaker cells to spontaneously initiate an electrical
impulse, SA node, AV junction, and Purkinje fibers
excitability - Answer- ability to respond to stimuli
conductivity - Answer- Ability to receive an electrical stimulus and conduct that impulse
to adjacent cells - all cardiac cells possess this.
contraction - Answer-Cardiac cells shorten, causing muscular contraction in response to
an electrical stimulus
SA node - Answer-Sino-atrial node; the pace-maker of the heart; where the impulse
conduction of the heart usually starts; located in the top of the right atrium. 60-100 bpm
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