COMPLETE QUESTIONS AND
ANSWERS |LATEST
UPDATE|RATED 100%CORRECT
depolarization - ANSWER ✔✔- inside of cell becomes positive,
outside negative
- contraction
- na+ channel opens
- ELECTRICAL
repolarization - ANSWER ✔✔movement of cells = inside is negative
again
,- na+ channels close, k+ channels open
- MECHANICAL
p wave
qrs wave
t wave - ANSWER ✔✔- (p) atrial depolarization
- (qrs) ventricular depolarization
- (t) ventricular repolarization
refractory period - ANSWER ✔✔per of time where cardiac cells
cannot respond to stimulus
absolute refractory period - ANSWER ✔✔beginning of qrs to peak of
t wave
relative refractory (vulnerable per of repolarization) - ANSWER ✔✔-
cardiac cells have repolarized enough to respond to strong stimulus
- during this per a strong stimulus may overtake the pacemaker of the
heart
- ex. PVC during vulnerable period may turn into vtach or torsades
- prolonged QT interval inc possibility
,causes of prolonged qt intervals - ANSWER ✔✔haldol, bradycardia,
hypokalemia
automaticity - ANSWER ✔✔ability of pacemaker cells to initiate
electrical impulse
excitability - ANSWER ✔✔ability of muscle cells to respond to
outside stimulus
conductivity - ANSWER ✔✔ability to recieve electrical stimulus and
conduct impulse to adjacent cells
contraction - ANSWER ✔✔cardiac cells shorten = muscular
contraction in response to electrical stimulus
sa node - ANSWER ✔✔- primary pacemaker of heart
- 60-90 bpm
av node - ANSWER ✔✔delay = atrial contraction + ventricular filling
- 40-60 bpm
bundle of his - ANSWER ✔✔ability to self initiate electrical activity
- 40-60 bpm
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, purkinje fibers - ANSWER ✔✔network of fibers that carry electrical
impulse to ventricular muscle cells
- 20-40 bpm
NSR
Brady
Tachy
SVT
Junctional
Ventricular rhythm - ANSWER ✔✔NSR 60-100
Brady 40-60
Tachy >100
SVT >150
Junctional 40-60
Ventricular rhythm 20 - 40
PR interval - ANSWER ✔✔0.12-0.20
beginning of p to beginning of qrs
qrs interval - ANSWER ✔✔< 0.12