4/24/26 9 Heart Conduction System + ECG/EKG

Pace maker of the heart

SA node

atrioventricular bundle

AV bundle

also known as the atrioventricular node

AV node

also known as HIS bundle

AV bundle

sinotrial node

SA node

carry impulses through ventricles and cause them to contract

purkjine fibers

causes a delay in the conduction of the heart allowing the atria to fully empty and close their valves

AV node

left and right side

bundle branches

genertastes electic impulse every 60 to 100 seconds

SA node

located between atria and ventricles

AV node

located eight atrial wall

SA node

long cells that spread through ventriclar muscle tissue

purkinje fibers

passes the impulse to the AV node

SA node

send impulses to bundle branches

AV bundle

send impulses to purkinje fibers

bundle branches

send impulse to av bundle

AV node

triggers the atria to contract

SA node

when your heart beats the electricity to cause it to beat comes from ___________ due to this feature we say that the hearts conduction system is ______ meaning that the electricity comes from the heart itself

within SA node

Intrinsic

the human heart beats _____ beats per minute on average this rate of the heart is set by the ______

72

SA node

because the SA node sets the rate of your heart beat we call it ______ of the heart. The Sa node is located in the _______ of the heart

pacemaker

right atrium

when it fires an electrical impulse it triggers the ____ to contract Not only does the SA node cause those chambers to contract it also passes the electrical impulse to the ______

atria

Av node

the av node is the location between _______ the purpose of the av node is to cause a _____

atria and ventricles

delay

this delay is important because it provides time for the ________________ the av node also passes the impulse to the ___________________

atria to empty of the blood and close to bicuspid and tri valve

AV bundle

The AV bundle is located within the _______ of the heart it is also known as the _________

septum

bundle of his

It passes impulses to the __________ there are ____ bundle branches

bundle branches

2

the right branch carries the impulse through the _____ the left branch carries the impulse through the ________

right ventricle

left ventricle

both bundle branches pass impulses to the __________ the purkinje fibers spread impulses through the _______.

purkige fibers

ventricle muscles

this spreading of impulses causes __________

ventricles to contract

which order does an impulse pass through the structures

1. SA node

2. AV node

3. AV bundle

4. Bundle Branches

5. Purkinje fibers

what does ECG stand for

electrocardiogram

what does ECG/EKG measure

Electrical activity heart condition system

what is the difference between depolarization and depolarization

during depolarization a chamber of the heart contracts during repolarization chamber of heart rests

de=contacts

re=rests

p wave

SA node fires impulse travels through atria triggering concentration

P-Q interval

atrial depolarization is complete

QRS complex

ventricular depolarization begins @ apex

S-T segment

ventricular depolarization is complete

T wave

ventricular repolarization begins at apex

portion after the t wave

ventricular repolar= Complete