Download Electrical System of the heart

Electrical System of the
heart
Taelar Shelton, MS, ATC, AT/L
Systole vs Diastole
 Systole: contraction
 Diastole: relaxation
Events in cardiac cycle
 Atrial systole with ventricular diastole
 Blood flows from atria to ventricles
 “Lubb”
 Ventricular systole with atrial diastole
 Blood flows from ventricles to arteries
 “Dubb”
 Atrial and ventricular diastole
Electrical System
Electrical Impulse
 SA node: pacemaker, starts the electrical impulse
 Located in the right atrium
 Causes the heart to contract
 AV node: bridge between the atria and ventricles
 Purkinje system: carry the electrical signals throughout
the ventricles to make them contract
EKG