electrical conduction system of the heart

order, 6 total

1. sinoatrial node

2. bachmanns bundle

3. internodal pathways

4. atrioventricular node

5. bundle of his

6. perkinje fibers

1

sinoatrial node

2

backmanns bundle

3

internodal pathways

4

atrioventricular node

5

bundle of his

6

purkinje fibers

location: right atrium close to where it meets with the superior vena cava

sinoatrial node

hearts primary pace maker

sinoatrial node

marks start of hearts electrical conduction pathway

sinoatrial node

the sinoatrail node triggers sequential contraciton of…

atrial myocytes

triggers sequetnial contractions of atrial myocytes

sinoatrial node

contains fibrous tissue in septum

sinoatrial node

separates left and right side of heart

fibrous tissue in septum

hinders electrical signal transmission between sections of heart

fibrous tissue in spetum

fibrous tissue in septum is associated with

sinoatrial node

transmits signals from SA node across atrioseptal wall into left atria

bachmans bundle

what is the bachmanns bundle three step transmisison route

SA node

across atrioseptral wall

into left atria

what are the three routes of the interior nodal pathways

anterior

middle

posterior

three routes include

anterior

middle

posterior

internodal pathways

internodal pathways send signals from BLANK to Blank

sinoatrial node

atrioventricular node

signals from sinotrial node to atrioventricular node

inter-nodal pathways

location: in right atrium near coronary sinus and tricuspid valve

atrioventricular node

secondary pace maker

atrioventricular node

momentarily pause sinoatrial node signals before it can go into ventricles

atrioventricular node

what is the purpose of the atrioventricular node

pause SA node before it goes to ventricles

why does the secondary pacemaker pause the SA node before going into ventricles

so atria can contract and all blood can reach ventricles

transmission cells from SA node to right atrium to interventricular septum and branch off into left and right ventricle

bundle of his

describe the “bundle of his” pathway

SA node

to right atrium

to inter ventricular septum

branch off into left and right ventricle

right bundle branch signals to..

right ventricle

left bundle branch signals to

left ventricle

projects from both right and left bundle branches

purkinje fibers

perkinje fibers project from…

both bundle branches

purkinje fibers directly interface with …

heart myocytes

dirctly interface with hearts myocytes

purkinje fibers

what is the main role of purkinje fibers (2)

start depolarization within muscle cells

trigger contraction in cardiac muscle

whats faster

ventricular myocyte transmission or bundle branch transmission?

bundle branch