label the heart names of layers chambers valves major blood vessels
TRANSCRIPT
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LABEL THE HEART
• NAMES OF LAYERS
• CHAMBERS
• VALVES
• MAJOR BLOOD VESSELS
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CARDIOVASCULAR SYSTEM
• ALSO KNOW AS CIRCULATORY SYSTEM
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CV SYSTEM
• HEART
• BLOOD VESSELS
• BLOOD
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TRANSPORTATION SYSTEM
• TRANSPORTS– OXYGEN– NUTRIENTS TO BODY CELLS– CARBON DIOXIDE – METABOLIC MATERIALS AWAY FROM
BODY CELLS
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HEART
• MUSCULAR, HOLLOW ORGAN• PUMP OF THE BODY• SIZE OF CLOSED FIST• LOCATED
– MEDIASTINAL CAVITY– BETWEEN HEART AND LUNGS– BEHIND STERNUM– ABOVE DIAPHRAGM
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THREE LAYERS OF TISSUE
• ENDOCARDIUM
• MYOCARDIUM
• PERICARDIUM
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ENDOCARDIUM
• SMOOTH LAYER OF CELLS
• LINES THE INSIDE OF THE HEART & BLOOD VESSELS
• ALLOWS FOR SMOOTH FLOW OF BLOOD
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MYOCARDIUM
• Thickest layer
• muscular middle layer
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PERICARDIUM
• DOUBLE LAYERED MEMBRANE OR SAC
• COVERS THE OUTSIDE OF THE HEART
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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
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HEART CHAMBERS
• FOUR PARTS OR CHAMBERS
• TWO UPPER CHAMBERS– ATRIA
• TWO LOWER CHAMBERS– VENTRICLES
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VALVES
• TRICUSPID VALVE– RIGHT ATRIUM & RIGHT VENTRICLE
• PULMONARY VALVE– RIGHT VENTRICLE AND PULMONARY
ARTERY
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MITRAL VALVE
• LEFT ATRIUM AND LEFT VENTRICLE
• AORTIC VALVE
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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)
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RIGHT ARTIUM
• RECEIVES BLOOD– AS RETURNS FROM BODY CELLS
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RIGHT VENTRICLE
• RECEIVES BLOOD – FROM RIGHT ATRIUM– PUSHES BLOOD
• INTO PULMONARY ARTERYWHICH CARRIES BLOOD TO LUNGS FOR OXYGEN
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LEFT ATRIUM
• RECEIVES OXYGENATED BLOOD FROM LUNGS
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LEFT VENTRICLE
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RECEIVES BLOOD FROM THE LEFT ATRIUM
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PUSHES BLOOD INTO THE AORTA
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VALVES
• ONE WAYVALVES IN CHAMBERS OF HEART KEEP BLOOD FLOWING RIGHT DIRECTION– TRICUSPID– PULMONARY– MITRAL – AORTIC
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CONDUCTIVE PATHWAY
• Electrical impulses starting in the heart cause contraction of the muscles.
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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.
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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
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Bundle of HIS
• Nerve fibers in septum
• Right and left bundle branches
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Right and left bundle branches
• Carry impulse down through ventricles
• Subdivide into a network of nerve fibers in ventricle called purkinje fibers.
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Purkinje fibers
• Final conduction pathway
• Spread to all muscle tissue in the ventricles
• Ventricles contract
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Conduction
• Occurs approximately every 0.8 seconds.
• Electrical impulse can be recorded on an EKG
• Used to detect abnormal activity or disease.
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THE END