11. Electrical activity of the heart

What does SAN stand for?

Sinoatrial node

Where is the SAN found?

Right arterial chamber muscular wall

What does the AVN stand for?

Atrioventricular node

Where is the AVN found?

Between atria and ventricles -> upper part of interventricular septum

What is cardiac muscle?

Myogenic

What does myogenic mean?

It generates its own electrical transmission

What does the sinoatrial node do?

Pacemaker of the heart -> generates electrical impulses causing muscular contractions in the atria concentrated in the structure of SAN -> blood goes into ventricles

What does the atrioventricular node do?

0.1s delay in electrical signal -> delays muscular contraction of ventricles which allows for ventricular filling

What does the bundle of His do?

Send electrical signal between 2 ventricles (no muscular contractions)

What do the purkinje fibres do?

Sends electrical activity through ventricle chamber (external walls, causing muscular contraction from apex up)