DHO 78 pg 186 HS120162017 Electrical impulses in the heart cause its cyclic contractions Conductive pathway includes SA node AV node Bundle of His ID: 784517
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Slide1
Circulatory SystemConductive Pathway
DHO 7.8 pg. 186
HS1/2016-2017
Slide2Electrical impulses in the heart cause its cyclic contractionsConductive pathway includes:SA nodeAV nodeBundle of His
R/L Bundle Branch
Purkinje fibers
Conductive Pathway
Slide3Sinoatrial (SA) node:body’s natural pacemakergroup of nerve cells in RA that sends electrical impulseimpulse spreads out over R & L atriaatria contract & push blood into ventricles
Conductive Pathway
Slide4Atrioventricular (AV) node:after impulse from SA node passes through atria, it reaches AV nodegroup of nerve cells between atria & ventricles
Conductive Pathway
Slide5Bundle of His:after impulse reaches AV node, AV node sends impulse through the bundle of Hisnerve fibers in the septum
Conductive Pathway
Slide6R and L Bundle Branches:Bundle of His divides into R bundle branch & L bundle branchcarry impulse down through the ventricles
Conductive Pathway
Slide7Purkinje fibers:R & L bundle branches subdivide into Purkinje fibersnetwork of nerve fibers throughout the ventriclesConductive Pathway
Slide8Conductive Pathwayhttps://
www.youtube.com/watch?v=fZT9vlbL2uA
(1:37)
Slide9Through this pathway, electrical impulses reach all the muscle tissue in the ventricles & they contractThis pattern occurs about every 0.8 secondsThe movement of the electrical impulse can be recorded on an electrocardiogram (EKG, ECG)
Conductive Pathway
Slide10Where does an electrical impulse go after it leaves the Bundle of his?SA nodeAortaAV nodePurkinje fibers
Correct answer: D
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Slide11Which structure receives the signal (action potential) between the atria and the ventricles?ApexSA nodeBundle branchesAV node
Correct answer: D
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Slide12Conductive PathwayArrhythmia
Slide13Arrhythmia:abnormal heart rhythmhappens if something interferes with the normal electrical conduction pattern can be mild or life-threateningdiagnosed with EKG
Arrhythmia
Slide14Types of arrhythmias:Premature atrial contraction (PAC)-early contraction of the atria; mild arrhythmia
Ventricle fibrillation-ventricles contract at random, decreasing blood output
; life threatening arrhythmia
Arrhythmia
Slide15https://www.youtube.com/watch?v=V-BfEQvv8rk
Ventricular Fibrillation
Slide16Treatment of arrhythmia:depends of type and severityPacemakerDefibrillation
Arrhythmia
Slide17Defibrillation: Life-threatening fibrillations are treated with defibrillatorDefibrillator-shocks the heart to stop uncoordinated contractions and let SA node regain control
Arrhythmia
Slide18Pacemaker:battery-powered device with electrodes that are threaded through a vein and into RA & RVmonitors & regulates the heart’s rhythm
delivers electrical impulses through the electrodes to stimulate contraction
Arrhythmia
Slide19Pacemaker:Modern pacemakers are protected from electromagnetic forces like microwave ovenPeople with pacemakers should avoid close contact with digital cell phones-educate them not to keep phone in their shirt pocket
Arrhythmia
Slide20Pacemaker:Fixed or demand pacemakerFixed-deliver impulses at predetermined rate
Demand-deliver impulses only when heart’s own conduction system isn’t working
Arrhythmia
Slide21What circulatory disorder could be diagnosed with an electrocardiogram?AnemiaFibrillationHypertensionEmbolism
Correct answer: B
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