Questions and Answers
EndocardiumA-
AAnswerATheAinnermostAlayerAofAtheAheart,AitAformsAtheAliningAandAfoldsAbackAontoAitse
lfAtoAformAtheAfourAvalves.AItAisAinAthisAlayerAthatAtheAconductionAsystemAisAfound
MyocardiumA-AAnswerAMuscularAlayerAofAtheAheart
EpicardiumA-
AAnswerATheAoutermostAlayerAofAtheAheart.AItAisAactuallyAtheAinnerAlayerAofAtheApericar
dium
RightAatriumA-
AAnswerAReceivesAdeoxygenatedAbloodAreturningAtoAtheAheartAfromAtheAbodyAviaAtheAsu
periorAvenaAcavAwhichAcarriesAbloodAfromAtheAupperAbodyAandAtheAinferiorAvenaAcavaAwhi
chAcarriesAbloodAfromAtheAlowerAbody.
RightAventricleA-
AAnswerAReceivesAdeoxygenatedAbloodAfromAtheArightAatriumAwhichApumpsAtoAtheAlungs
AforAoxygenationAthroughAtheApulmonaryAarteryA(trunk)AtoAtheArightAandAleftApulmonaryAar
teries
LeftAatriumA-
AAnswerAReceivesAoxygenatedAbloodAreturningAfromAtheAlungsAviaAtheArightAandAleftApul
monaryAveins.
LeftAventricleA-
AAnswerAReceivesAtheAoxygenatedAbloodAfromAtheAleftAatriumAandApumpsAitAtoAtheAbody
AthroughAtheAaorta,AtheAlargestAarteryAofAtheAbody.
TheAtwoAsemilunarAvalvesA-AAnswerAPulmonicAvalvesAandAaorticAvalves
HeartASoundsAS1A-
AAnswerAFirstAheartAsoundAisAdueAtoAtheAclosureAofAtheAmitralAandAtricuspidAvalves
, HeartASoundsAS2A-
AAnswerASecondAheartAsoudnAisAdueAtoAclosureAofAtheAaorticAandApulmonicAvalves
CoronaryAarteriesA-AAnswerATheAarteriesAsupplyingAtheAheartAwithAblood
SympatheticANervousASystemA-
AAnswerAAffectsAbothAtheAventriclesAandAatriumAbyAincreasingAheartArate,AconductionAand
Airritability
ParasympatheticANervousASystemA-
AAnswerAAffectsAtheAatriaAonlyAbyAdecreasingAheartArate,AconductionAandAirritability
AutomaticityA-
AAnswerAThisAisAtheAabilityAofAtheAcardiacAcellsAtoAstimulateAtheirAownAelectricalAimpuls
eAwithoutAbeingAstimulatedAfromAanotherAsource
ExcitabilityA-
AAnswerAIrritability,AsharedAbyAallAcardiacAcellsAandAitAtheAabilityAtoArespondAtoAextern
alAstimulus;Aelectrical,AchemicalAandAmechanical
ConductivityA-
AAnswerAThisAisAtheAabilityAofAallAcardiacAcelllsAtoAreceiveAandAelectricalAstimulusAadnAt
ransmitAtheAstimulusAotAtheAotherAcardiacAcells
ContractilityA-
AAnswerAThisAisAtheAabilityAofAtheAcardiacAcellsAtoAshortenAandAcauseAcardiacAmuscleAco
ntractionAinAresponseAtoAanAelectricalAstimulus
SAAnodeA-AAnswerAPrimaryApacemakerAofAtheAheart,AinstriniscArateAofA60A-
100AbeatsAperAminute
AVAnodeA-
AAnswerALocatedAatAtheAposteriorAseptalAwallAofAtheArightAatrium,AjustAaboveAtheAtricus
pidAvalve.AThereAisAaA1/10thAofAaAsecondAdelayAofAelectricalAactivityAatAthisAlevelAtoAallo
wAtheAbloodAtoAflowAfromAtheAatriaAtoAtheAventricles.AIntrinsicArateAofA40-
60AbeatsAperAminute