LABEL THE HEART NAMES OF LAYERS CHAMBERS VALVES

LABEL THE HEART • • NAMES OF LAYERS CHAMBERS VALVES MAJOR BLOOD VESSELS

CARDIOVASCULAR SYSTEM • ALSO KNOW AS CIRCULATORY SYSTEM

CV SYSTEM • HEART • BLOOD VESSELS • BLOOD

TRANSPORTATION SYSTEM • TRANSPORTS – OXYGEN – NUTRIENTS TO BODY CELLS – CARBON DIOXIDE – METABOLIC MATERIALS AWAY FROM BODY CELLS

HEART • • MUSCULAR, HOLLOW ORGAN PUMP OF THE BODY SIZE OF CLOSED FIST LOCATED – MEDIASTINAL CAVITY – BETWEEN HEART AND LUNGS – BEHIND STERNUM – ABOVE DIAPHRAGM

THREE LAYERS OF TISSUE • ENDOCARDIUM • MYOCARDIUM • PERICARDIUM

ENDOCARDIUM • SMOOTH LAYER OF CELLS • LINES THE INSIDE OF THE HEART & BLOOD VESSELS • ALLOWS FOR SMOOTH FLOW OF BLOOD

MYOCARDIUM • Thickest layer • muscular middle layer

PERICARDIUM • DOUBLE LAYERED MEMBRANE OR SAC • COVERS THE OUTSIDE OF THE HEART

SEPTUM • MUSCULAR WALL • SEPARATES HEART INTO RIGHT AND LEFT SIDE • PREVENTS BLOOD FROM MOVING BETWEEN THE RIGHT AND LEFT SIDE OF THE HEART • UPPER PART OF SEPTUM CALLED – INTERATRIAL SEPTUM • LOWER PART CALLED – INTERVENTRICULAR SEPTUM

HEART CHAMBERS • FOUR PARTS OR CHAMBERS • TWO UPPER CHAMBERS – ATRIA • TWO LOWER CHAMBERS – VENTRICLES

VALVES • TRICUSPID VALVE – RIGHT ATRIUM & RIGHT VENTRICLE • PULMONARY VALVE – RIGHT VENTRICLE AND PULMONARY ARTERY

MITRAL VALVE • LEFT ATRIUM AND LEFT VENTRICLE • AORTIC VALVE

HEART BEAT CYCLE • RIGHT & LEFT SIDES OF HEART WORK TOGETHER • ELECTRICAL IMPULSE CAUSES MYOCARDIUM TO CONTRACT • PERIOD OF CONTRACTIONOR (SYSTOLE) FOLLOWED BY A BRIEF PERIOD OF REST (DIASTOLE)

RIGHT ARTIUM • RECEIVES BLOOD – AS RETURNS FROM BODY CELLS

RIGHT VENTRICLE • RECEIVES BLOOD – FROM RIGHT ATRIUM – PUSHES BLOOD • INTO PULMONARY ARTERYWHICH CARRIES BLOOD TO LUNGS FOR OXYGEN

LEFT ATRIUM • RECEIVES OXYGENATED BLOOD FROM LUNGS

LEFT VENTRICLE

RECEIVES BLOOD FROM THE LEFT ATRIUM

PUSHES BLOOD INTO THE AORTA

VALVES • ONE WAYVALVES IN CHAMBERS OF HEART KEEP BLOOD FLOWING RIGHT DIRECTION – TRICUSPID – PULMONARY – MITRAL – AORTIC

CONDUCTIVE PATHWAY • Electrical impulses starting in the heart cause contraction of the muscles.

Sinoatrial node (SA) • Group of nerves located in right atrium • Pacemaker • Sends electrical impulse that spreads over muscle of atria • Atrial muscles contract then push blood into ventricels. • After impulse goes through atria reaches the Atrioventricular (AV) node.

Atrioventricular (AV) node • • Group of nerve cells Located between the atria and ventricles Electrical impulse through septum Nerve fibers in septum called bundle of HIS

Bundle of HIS • Nerve fibers in septum • Right and left bundle branches

Right and left bundle branches • Carry impulse down through ventricles • Subdivide into a network of nerve fibers in ventricle called purkinje fibers.

Purkinje fibers • Final conduction pathway • Spread to all muscle tissue in the ventricles • Ventricles contract

Conduction • Occurs approximately every 0. 8 seconds. • Electrical impulse can be recorded on an EKG • Used to detect abnormal activity or disease.

THE END