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Sinoatrial node (SA node)

is stimulated by the nervous system to begin the heart beat. Called pacemaker of the heart. Found in THE atrium.

Atrioventricular node (AV node)

is then stimulated. It is found at the base of the atrium.

Bundle of His and Purkinje Fibers

continue to route the eletricial conductivity of the heart.

Phase: Systolic

atrium and ventricles contracts.

Phase 2: Diastole

atrium and ventricles relax

Erythroblastosis fetalis

when a baby have a different Rh+/- from the mother.


treatment for injection given soon after birth of child.

Cardic tendons

keep the valvesfrom letting any blood from given into the atrium.


Tough protective sac that surrounds the heart.


Inferior wall that divides the heart into the left and right.

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