SA and AV node

septum

Divides the right and left chambers of the heart

stage 1 of heart contraction

SA node sends electrical impulses

Stage 4 of heart contraction

heart contracts

AV (atrioventricular) node

located in the right atrium along the lower part of the interatrial septum, relays signals to the ventricles, heart contractions

SA (sinoatrial) node (pacemaker)

located in the wall of the right atrium near the opening of the superior vena cava, generate electrical impulses in atria, and set rate of heart contractions

apex of the heart

lower tip of the heart

Electrocardiogram (ECG)

A recording of the electrical activity of the heart, provides heart health, patience with an abnormal heartbeat are implanted an artificial pacemakerr

stage 2 of heart contraction

signals pass to AV node

stage 3 of heart contraction

AV node consist of specialize muscle fibers that reach down to the apex