14PERICARDIUM DOUBLE LAYERED MEMBRANE OR SAC COVERS THE OUTSIDE OF THE HEART
15SEPTUM MUSCULAR WALL SEPARATES HEART INTO RIGHT AND LEFT SIDE PREVENTS BLOOD FROM MOVING BETWEEN THE RIGHT AND LEFT SIDE OF THE HEARTUPPER PART OF SEPTUM CALLEDINTERATRIAL SEPTUMLOWER PART CALLEDINTERVENTRICULAR SEPTUM
16HEART CHAMBERS FOUR PARTS OR CHAMBERS TWO UPPER CHAMBERS ATRIATWO LOWER CHAMBERSVENTRICLES
29CONDUCTIVE PATHWAYElectrical impulses starting in the heart cause contraction of the muscles.
30Sinoatrial node (SA) Group of nerves located in right atrium Pacemaker Sends electrical impulse that spreads over muscle of atriaAtrial muscles contract then push blood into ventricels.After impulse goes through atria reaches the Atrioventricular (AV) node.
31Atrioventricular (AV) node Group of nerve cellsLocated between the atria and ventriclesElectrical impulse through septumNerve fibers in septum called bundle of HIS
32Bundle of HISNerve fibers in septumRight and left bundle branches
33Right and left bundle branches Carry impulse down through ventriclesSubdivide into a network of nerve fibers in ventricle called purkinje fibers.
34Purkinje fibers Final conduction pathway Spread to all muscle tissue in the ventriclesVentricles contract
35Conduction Occurs approximately every 0.8 seconds. Electrical impulse can be recorded on an EKGUsed to detect abnormal activity or disease.