advertisement

electrical system of the heart

electrical system of the heart.

in the normal heart, electrical impulses pace the rhythm at which the heart contracts and relaxes. the sinoatrial (sa) node triggers the electrical impulse, causing the upper chambers (atria) to contract. the signal travels through the atrioventricular (av) node to the atrioventricular bundle, which divides into the purkinje fibres. the fibres carry the signal and cause the lower chambers (ventricles) to contract.

the electrocardiogram (ekg, ecg) tracing above reflects this normal electrical activity.

current as of: june 24, 2023

author: healthwise staff
clinical review board
all healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use. learn how we develop our content.

advertisement

advertisement