EXAM 1 NUR 232 FUNCTION OF THE
HEART EXAM QUESTIONS AND
ANSWERS
- JN3rANSWERS--The JN3rcardiac JN3rconduction JN3rsystem JN3rgenerates JN3rand
JN3rtransmits JN3relectrical JN3rimpulses JN3rthat JN3rstimulate JN3rcontraction JN3rof JN3rthe
JN3rmyo- JN3rcardium. JN3rUnder JN3rnormal JN3rcircumstances, JN3rthe JN3rconduction
JN3rsys- JN3rtem JN3rfirst JN3rstimulates JN3rcontraction JN3rof JN3rthe JN3ratria JN3rand
JN3rthen JN3rthe JN3rventricles. JN3rThe JN3rsynchronization JN3rof JN3rthe JN3ratrial JN3rand
JN3rventricular JN3revents JN3rallows JN3rthe JN3rventricles JN3rto JN3rfill JN3rcompletely
JN3rbefore JN3rven- JN3rtricular JN3rejection, JN3rthereby JN3rmaximizing JN3rcardiac
JN3routput. JN3rThree JN3rphysiologic JN3rcharacteristics JN3rof JN3rtwo JN3rtypes JN3rof
JN3rspecialized JN3relec- JN3rtrical JN3rcells, JN3rthe JN3rnodal JN3rcells JN3rand JN3rthe
JN3rPurkinje JN3rcells, JN3rprovide JN3rthis JN3rsynchronization:
• JN3rAutomaticity: JN3rability JN3rto JN3rinitiate JN3ran JN3relectrical JN3rimpulse JN3r•
JN3rExcitability: JN3rability JN3rto JN3rrespond JN3rto JN3ran JN3relectrical JN3rimpulse JN3r•
JN3rConductivity: JN3rability JN3rto JN3rtransmit JN3ran JN3relectrical JN3rimpulse
from JN3rone JN3rcell JN3rto JN3ranother JN3rBoth JN3rthe JN3rsinoatrial JN3r(SA) JN3rnode
JN3r(the JN3rprimary JN3rpacemaker
of JN3rthe JN3rheart) JN3rand JN3rthe JN3ratrioventricular JN3r(AV) JN3rnode JN3r(the JN3rsec-
JN3rondary JN3rpacemaker JN3rof JN3rthe JN3rheart) JN3rare JN3rcomposed JN3rof JN3rnodal
JN3rcells. JN3rThe JN3rSA JN3rnode JN3ris JN3rlocated JN3rat JN3rthe JN3rjunction JN3rof JN3rthe
JN3rsuperior JN3rvena JN3rcava JN3rand JN3rthe JN3rright JN3ratrium JN3r(Fig. JN3r25-3).
JN3rThe JN3rSA JN3rnode JN3rin JN3ra JN3rnormal JN3rresting JN3radult JN3rheart JN3rhas JN3ran
JN3rinherent JN3rfiring JN3rrate JN3rof JN3r60 JN3rto JN3r100 JN3rimpulses JN3rper JN3rminute;
JN3rhowever, JN3rthe JN3rrate JN3rchanges JN3rin JN3rresponse JN3rto JN3rthe JN3rmetabolic
JN3rdemands JN3rof JN3rthe JN3rbody JN3r(Weber JN3r& JN3rKelley, JN3r2010).
The JN3relectrical JN3rimpulses JN3rinitiated JN3rby JN3rthe JN3rSA JN3rnode JN3rare JN3rcon-
JN3rducted JN3ralong JN3rthe JN3rmyocardial JN3rcells JN3rof JN3rthe JN3ratria JN3rvia
JN3rspecial- JN3rized JN3rtracts JN3rcalled JN3rinternodal JN3rpathways. JN3rThe JN3rimpulses
JN3rcause
JN3r(L. JN3r657)
L., JN3rHinkle, JN3rJ., JN3rCheever, JN3rH.. JN3rBrunner JN3r& JN3rSuddarth's JN3rTextbook
JN3rof JN3rMedical-Surgical JN3rNursing, JN3r13th JN3rEdition. JN3rLippincott JN3rWilliams
JN3r& JN3rWilkins, JN3r12/2013. JN3rVitalBook JN3rfile.
What's JN3rthe JN3rfunction JN3rof JN3rcardiac JN3rconduction JN3rsystem? JN3r-
JN3rANSWERS--generates JN3rand JN3rtransmits JN3relectrical JN3rimpulses JN3rthat
JN3rstimulate JN3rcontraction JN3rof JN3rthe JN3rmyo- JN3rcardium.
Conduction JN3rsystem JN3rkeeps JN3rthings JN3rin JN3rorder. JN3r
HEART EXAM QUESTIONS AND
ANSWERS
- JN3rANSWERS--The JN3rcardiac JN3rconduction JN3rsystem JN3rgenerates JN3rand
JN3rtransmits JN3relectrical JN3rimpulses JN3rthat JN3rstimulate JN3rcontraction JN3rof JN3rthe
JN3rmyo- JN3rcardium. JN3rUnder JN3rnormal JN3rcircumstances, JN3rthe JN3rconduction
JN3rsys- JN3rtem JN3rfirst JN3rstimulates JN3rcontraction JN3rof JN3rthe JN3ratria JN3rand
JN3rthen JN3rthe JN3rventricles. JN3rThe JN3rsynchronization JN3rof JN3rthe JN3ratrial JN3rand
JN3rventricular JN3revents JN3rallows JN3rthe JN3rventricles JN3rto JN3rfill JN3rcompletely
JN3rbefore JN3rven- JN3rtricular JN3rejection, JN3rthereby JN3rmaximizing JN3rcardiac
JN3routput. JN3rThree JN3rphysiologic JN3rcharacteristics JN3rof JN3rtwo JN3rtypes JN3rof
JN3rspecialized JN3relec- JN3rtrical JN3rcells, JN3rthe JN3rnodal JN3rcells JN3rand JN3rthe
JN3rPurkinje JN3rcells, JN3rprovide JN3rthis JN3rsynchronization:
• JN3rAutomaticity: JN3rability JN3rto JN3rinitiate JN3ran JN3relectrical JN3rimpulse JN3r•
JN3rExcitability: JN3rability JN3rto JN3rrespond JN3rto JN3ran JN3relectrical JN3rimpulse JN3r•
JN3rConductivity: JN3rability JN3rto JN3rtransmit JN3ran JN3relectrical JN3rimpulse
from JN3rone JN3rcell JN3rto JN3ranother JN3rBoth JN3rthe JN3rsinoatrial JN3r(SA) JN3rnode
JN3r(the JN3rprimary JN3rpacemaker
of JN3rthe JN3rheart) JN3rand JN3rthe JN3ratrioventricular JN3r(AV) JN3rnode JN3r(the JN3rsec-
JN3rondary JN3rpacemaker JN3rof JN3rthe JN3rheart) JN3rare JN3rcomposed JN3rof JN3rnodal
JN3rcells. JN3rThe JN3rSA JN3rnode JN3ris JN3rlocated JN3rat JN3rthe JN3rjunction JN3rof JN3rthe
JN3rsuperior JN3rvena JN3rcava JN3rand JN3rthe JN3rright JN3ratrium JN3r(Fig. JN3r25-3).
JN3rThe JN3rSA JN3rnode JN3rin JN3ra JN3rnormal JN3rresting JN3radult JN3rheart JN3rhas JN3ran
JN3rinherent JN3rfiring JN3rrate JN3rof JN3r60 JN3rto JN3r100 JN3rimpulses JN3rper JN3rminute;
JN3rhowever, JN3rthe JN3rrate JN3rchanges JN3rin JN3rresponse JN3rto JN3rthe JN3rmetabolic
JN3rdemands JN3rof JN3rthe JN3rbody JN3r(Weber JN3r& JN3rKelley, JN3r2010).
The JN3relectrical JN3rimpulses JN3rinitiated JN3rby JN3rthe JN3rSA JN3rnode JN3rare JN3rcon-
JN3rducted JN3ralong JN3rthe JN3rmyocardial JN3rcells JN3rof JN3rthe JN3ratria JN3rvia
JN3rspecial- JN3rized JN3rtracts JN3rcalled JN3rinternodal JN3rpathways. JN3rThe JN3rimpulses
JN3rcause
JN3r(L. JN3r657)
L., JN3rHinkle, JN3rJ., JN3rCheever, JN3rH.. JN3rBrunner JN3r& JN3rSuddarth's JN3rTextbook
JN3rof JN3rMedical-Surgical JN3rNursing, JN3r13th JN3rEdition. JN3rLippincott JN3rWilliams
JN3r& JN3rWilkins, JN3r12/2013. JN3rVitalBook JN3rfile.
What's JN3rthe JN3rfunction JN3rof JN3rcardiac JN3rconduction JN3rsystem? JN3r-
JN3rANSWERS--generates JN3rand JN3rtransmits JN3relectrical JN3rimpulses JN3rthat
JN3rstimulate JN3rcontraction JN3rof JN3rthe JN3rmyo- JN3rcardium.
Conduction JN3rsystem JN3rkeeps JN3rthings JN3rin JN3rorder. JN3r
