the heart. function to pump blood through the body via the arteries, capillaries, and veins did you...
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THE HEART
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FUNCTION• TO PUMP BLOOD THROUGH THE BODY
VIA THE ARTERIES, CAPILLARIES, AND VEINS
DID YOU KNOW…THE HEART BEAT BEGINS AT 4 WEEKS
ENUTERO
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LOCATION• IN THE THORACIC CAVITY IN THE
MEDIASTINUM• THE BASE IS AT THE TOP AND THE APEX IS AT THE BOTTOM JUST LEFT OF THE MIDLINE
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CARDIAC MEMBRANES• PARIETAL PERICARDIUM – LINES THE CAVITY• VISCERAL PERICARDIUM – ON THE SURFACE OF THE HEART
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LAYERS OF THE HEART• EPICARDIUM – OUTERMOST LAYER OF
THE HEART TISSUE• MYOCARDIUM – MUSCLE THAT MAKES
UP THE CHAMBERS OF THE HEART• ENDOMETRIUM – INNER LAYER THAT IS
SMOOTH TO PREVENT ABNORMAL BLOOD CLOTTING. IT MAKES UP THE VALVES.
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CHAMBERS OF THE HEART• UPPER CHAMBERS – LEFT AND RIGHT
ATRIA SEPARATED BY THE INTERATRIAL SEPTUM
• LOWER CHAMBERS – LEFT AND RIGHT VENTRICLES SEPARATED BY THE INTERVENTRICULAR SEPTUM
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FLOW OF BLOOD• BLOOD ENTERS THE HEART FROM THE BODY VIA THE
SUPERIOR AND INFERIOR VENA CAVA• TRAVELS TO THE RIGHT ATRIUM• PASSES THROUGH THE RIGHT AV VALVE (TRICUSPID
VALVE)• TRAVELS TO THE RIGHT VENTRICLE• PASSES THROUGH THE PULMONARY SEMILUNAR VALVE• TRAVELS THROUGH THE PULMONARY ARTERY TO THE
LUNGS• BLOOD HAS BEEN DEOXYGENATED AND NEEDS TO GO
TO THE LUNGS TO PICK UP OXYGEN (BECOMES OXYGENATED BLOOD)
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FLOW OF BLOOD• BLOOD LEAVES LUNGS AND REENTERS HEART
THROUGH 4 PULMONARY VEINS• TRAVELS TO THE LEFT ATRIUM• PASSES THROUGH THE LEFT AV VALVE
(BICUSPID AKA MITRAL VALVE)• TRAVELS TO THE LEFT VENTRICLE• PASSES THROUGH THE AORTIC SEMILUNAR
VALVE• EXITS THE HEART THROUGH THE AORTA
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FLOW OF BLOOD• BLUE –• DEOXYGENATED
• RED –• OXYGENATED
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PARTS OF THE AORTA
• ASCENDING• AORTIC ARCH• DESCENDING• THORACIC• ABDOMINAL
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VALVES• PREVENT THE BACKFLOW OF BLOOD
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CARDIAC CYCLE• PULSE – “LUB DUB”• FIRST SOUND IS THE CONTRACTION OF THE
VENTRICLES CLOSING THE AV VALVES (LUB)• SECOND SOUND IS THE CLOSURE OF THE
AORTIC AND PULMONARY SEMILUNAR VALVES (DUB)
• MURMUR – VALVE DOESN’T CLOSE PROPERLY
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PULSE RATES• NORMAL – RESTING PULSE IS 60 - 90• BRADYCARDIA – RESTING PULSE LESS
THAN 60 • TACHYCARDIA – RESTING PULSE
GREATER THAN 100
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BLOOD PRESSURE• SYSTOLIC/DIASTOLIC• SYSTOLE – CONTRACTION OF THE
CHAMBERS OF THE HEART• DIASTOLE – RELAXATION OF THE
CHAMBER OF THE HEART• HYPERTENSION – BP GREATER THAN
140/90
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CARDIAC CONDUCTION• CARDIAC MUSCLE HAS THE ABILITY TO
CONTRACT SPONTANEOUSLY• SA NODE – NATURAL PACEMAKER OF
THE HEART LOCATED IN WALLS OF RIGHT ATRIUM
• IMPULSE TRAVELS TO THE AV NODE AND CONTINUES THROUGHOUT HEART
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CORONARY ARTERIES• SUPPLY BLOOD AND OXYGEN TO THE
HEART• FIRST BRANCHES OFF THE ASCENDING
AORTA
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REGULATION OF THE HEART• MEDULLA OBLONGATA