NRSG 421 – ECGs Exam Questions With Verified Answers.
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NRSG 421
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NRSG 421
NRSG 421 – ECGs Exam Questions With
Verified Answers.
Automaticity - answerthe ability of cardiac pacemaker cells to spontaneously initiate an
electrical impulse (Usually done by the SA node)
Na, K, Ca - answerNormal concentrations of these electrolytes are important in maintaining
automatic...
NRSG 421 – ECGs Exam Questions With
Verified Answers.
Automaticity - answer✔the ability of cardiac pacemaker cells to spontaneously initiate an
electrical impulse (Usually done by the SA node)
Na, K, Ca - answer✔Normal concentrations of these electrolytes are important in maintaining
automaticity
enhanced - answer✔____________________ automaticity can cause dysrhythmias
excitability - answer✔ability of cardiac cells to respond to an electrical impulse generated by
pacemaker cells or other stimuli
depolarization - answer✔this occurs when the cells become electrically excited
repolarization - answer✔occurs when cells return to the resting state
excitability - answer✔refers to the ability of cardiac muscle cells to respond to an outside
stimulus. The stimulus can be chemical (drugs, low K/Ca), mechanical, or electrical.
sodium enters cell - answer✔what electrolyte is involved in depolarization?
potassium exits cell and calcium enters - answer✔what electrolyte is involved in repolarization?
calcium enters cell - answer✔what electrolyte is involved in cardiac muscle contraction?
absolute refractory - answer✔cell will not respond to further stimulation
relative refractory - answer✔- vulnerable period
- some cardiac cells have repolarized and can be stimulated to respond to a stronger than normal
stimulus
bentricular depolarization and early repolarization - answer✔When does the absolute refractory
period occur?
ventricular repolarization - answer✔When does the relative refractory period occur?
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