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level: Level 1 of Chapter 2

Questions and Answers List

level questions: Level 1 of Chapter 2

QuestionAnswer
depolarization ischarged particles move into the cell causing contraction
repolarization does?allows the heart to rest
atrial repolarizationnot ekg detectable
atrial depolarizationdetectable on ekg
working cells of the heartmyocardial cells
cells what generate and conduct electrical impulsespacemaker cells
describe automaticityability of the pacemaker cells to initiate an electrical impulse without being stimulated from another source
describe excitabilityability of the cardiac muscle cells to respond to an outside stimulus
describe conductivityability of a cardiac cell to receive an electrical stimulus and conduct that stimulus to an adjacent cardiac cell
describe contractilityability of the cardiac cells to shorten, causing cardiac muscle contraction in response to an electrical stimulus
describe refractorinessthe period of recovery that cells need after being discharged before they are able to respond to a stimulus
where on the ekg is the refractory period?T wave
absolute refractory periodcells can not respond to any electrical impulse
relative refractory periodcells can depolarize if impulse is strong enough
what is the primary pacemakersinoatrial node
what stimulates the left atriumBachman's bundle
how does the impulse get to the AV node from the SA node?internodal pathways
what does the av node do?delays the impulse so the ventricles have time to fill with blood
what ventricle are the purkinjie fibers at?left ventricle
what is between the av node and the bundle branchesbundle of HIS
if the bundle of his has to pace the heart what is the rate and sections below it is pacing?40-60bpm for the left and right bundle branches
list 3 sections of the left bundle brachanterior fascicle, posterior fascicle, septal fascicle
if the purkinjie fibers have to pace what is the rate?20-40bpm
dysrhythmiasresult from impulse formation or impulse conduction disorders
partial conduction blockslow but all impulses are conducted
complete conduction blocksno impulses are conducted
what does reentry do?creates a loop that stimulates tissue that was already depolarized
how is the PR segment measured?end of p to start of qrs
how is st segment measuredend of s to end of t
how long is a QRS.11 seconds or less
what is the T wavethe repolarization of ventricles
how is the pr interval measuredstart of p to start of qrs
how long should a pr interval be?.12-.2
what are the numbers to label for the sequence method300 150 100 75 60 50
what do you divide by for small box method1500