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The Cardiovascular System

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ACTION POTENTIAL   THE CHANGE IN THE ELECTRICAL POTENTIAL OF THE HEART MUSCLE WHEN IT IS STIMULATED; DEPOLARIZATION FOLLOWED BY REPOLARIZATION  
AORTA   THE LARGEST ARTERY OF THE BODY; TRANSPORTS BLOOD FROM THE LEFT VENTRICLE OF THE HEART TO THE ENTIRE BODY.  
AORTIC SEMILUNAR VALVE   VALVE LOCATED IN THE AORTA THAT PREVENTS THE BACKFLOW OF BLOOD INTO THE LEFT VENTRICLE  
(AV) ATRIOVENTRICULAR NODE   DELAYS THE ELECTRICAL IMPULSE TO ALLOW THE ATRIA TO COMPLETE THEIR CONTRACTION  
(PL ATRIA) ATRIUM   TOP TWO CHAMBERS OF THE HEART  
AUTOMATICITY   THE ABILITY OF THE HEART TO INITIATE AN ELECTRICAL IMPULSE WITHOUT BEING STIMULATED BY ANOTHER OR INDEPENDENT SOURCE  
BUNDLE BRANCHES   LEFT AND RIGHT BRANCHES OF THE BUNDLE OF HIS THAT CONDUCT IMPULSES DOWN EITHER SIDE OF THE INTERVENTRICULAR SEPTUM TO THE LEFT AND RIGHT SIDE OF THE INTERVENTRICULAR SEPTUM TO THE LEFT AND RIGHT VENTRICLES.  
(AV BUNDLE)BUNDLE OF HIS   LOCATED NEXT TO THE AV NODE; PROVIDES THE TRANSFER OF THE ELECTRICAL IMPULSE FROM THE ATRIA TO THE VENTRICLES.  
CARDIAC CYCLE   THE CONTRACTION AND RELAXATION OF THE HEART  
COMPLEXES   ATRIAL OR VENTRICULAR CONTRACTIONS AS THEY APPEAR ON THE ECG; COMPLETE ECG WAVEFORMS.  
CONDUCTIVITY   THE ABILITY OF THE HEART CELLS TO RECEIVED AND TRANSMIT AN ELECTRICAL IMPULSE  
CONTRACTILITY   THE ABILITY OF THE HEART MUSCLE CELLS TO SHORTEN IN RESPONSE TO AN ELECTRICAL STIMULUS  
CORONARY CIRCULATION   THE CIRCULATION OF BLOOD TO AND FROM THE HEART MUSCLE  
DEOXYGENATED BLOOD   BLOOD THAT HAS LITTLE OR MINIMAL OXYGEN (OXYGEN - POOR BLOOD)  
DEPOLARIZATION   THE ELECTRICAL ACTIVATION OF THE CELLS OF THE HEART THAT INITIATES CONTRACTION OF THE HEART MUSCLE.  
DIASTOLE   THE PHASE OF THE CARDIAC CYCLE WHEN THE HEART IS EXPANDING AND REFILLING; ALSO KNOWN AS THE RELAXATION PHASE.  
EXCITABILITY   THE ABILITY OF THE HEART MUSCLE CELLS TO RESPOND TO AN IMPULSE OR STIMULUS.  
INTERVAL   THE PERIOD OF TIME BETWEEN TWO ACTIVITIES WITHIN THE HEART  
INTERVENTRICULAR SEPTUM   A PARTITION OR WALL (SEPTUM) THAT DIVIDES THE RIGHT AND LEFT VENTRICLES  
ISCHEMIA   LACK OF BLOOD SUPPLY TO AN AREA OF TISSUE DUE TO A BLOCKAGE IN THE CIRCULATION TO THAT AREA  
LEFT ATRIUM   THE LEFT UPPER CHAMBER OF THE HEART, WHICH RECEIVES BLOOD FROM THE LUNGS  
LEFT VENTRICLE   LEFT LOWER CHAMBER OF THE HEART, WHICH PUMPS OXYGENATED BLOOD THROUGH THE BODY. IT IS BIGGEST AND STRONGEST CHAMBER, KNOWN AS THE WORKHORSE OF THE HEART.  
MITRAL (BICUSPID) VALVE   VALVE WITH 2 CUSPS OR LEAFLETS LOCATED BETWEEN THE LEFT ATRIUM AND LEFT VENTRICLES; IT PREVENTS BACKFLOW OF BLOOD INTO THE LEFT ATRIUM.  
MYOCARDIAL   PERTAINING TO THE HEART (CARDIA) MUSCLE (MYO)  
OXYGENATED BLOOD   BLOOD HAVING OXYGEN (OXYGEN-RICH BLOOD).  
PERICARDIUM   A 2 LAYERED SAC OF TISSUE ENCLOSING THE HEART  
POLARIZATION   THE STATE OF CELLULAR REST IN WHICH THE INSIDE IS NEGATIVELY CHARGED AND THE OUTSIDE IS POSITIVELY CHARGED.  
PULMONARY ARTERY   LARGE ARTERY THAT TRASPORTS DEOXYGENATED BLOOD FROM THE RIGHT VENTRICLE TO THE LUNGS. THIS IS THE ONLY ARTERY IN THE BODY THAT CARRIES DEOXYGENATED BLOOD  
PULMONARY CIRCULATION   THE TRANSPORTATION OF BLOOD TO AND FROM THE LUNGS; BLOOD IS OXYGENATED IN THELUNGS DURING PULMONARY CIRCULATION  
PULMONARY SEMILUNAR VALVE   A VALVE FOUND INTHE PULONARY ARTERY THAT PREVENTS BACKFLOW OF BLOOD INTO THE RIGHT VENTRICLE DURING PULMONARY CIRCULATION  
PULMONARY VEIN   TRANSPORTS OXYGENATED BLOOD BACK INTO THE LEFT ATRIUM OF THE HEART.  
PURKINJE FIBERS   THE FIBERS WITHIN THE HEART THAT DISTRIBUTES ELECTRICAL IMPULSES FROM CELL TO CELL THOUGHOUT THE VENTRICLES  
PURKINJE NETWORK   SPREADS THE ELECTRICAL IMPULSE THOUGHOUT THE VENTRICLES BY MEANS OF THE PURKINJE FIBERS.  
REPOLARIZATION   WHEN HEART MUSCLES CELLS RETURN TO THEIR RESTING ELECTRICAL STATE AND THE HEART MUSCLE RELAXES  
RIGHT ATRIUM   THE RIGHT UPPER CHAMBER OF THE HEART, WHICH RECEIVES BLOOD FROM THE BODY.  
RIGHT VENTRICLE   THE RIGHT LOWER CHAMBER OF THE HEART, WICH PUMPS BLOOD TO THE LUNGS.  
SEGMENT   A PORTION OR PART OF THE ELECTRICAL TRACING PRODUCED BY THE HEART  
SEMILUNAR VALVE   A VALVE WITH HALF-MOON SHAPED CUSPS THAT OPEN AND CLOSE, ALLOWING BLOOD TO TRAVEL ONLY ONE WAY; LOCATED IN THE PULMONARY ARTERY AND THE AORTA  
SINOATRIAL (SA) NODE   AN AREA OF SPECIALIZED CELLS IN THE UPPER RIGHT ATRIUM THAT INITIATES THE HEARBEAT  
SYSTEMIC CIRCULATION   THE PATHWAYS FOR PUMPING BLOOD THROUGHOUT THE BODY AND BACK TO THE HEART  
SYSTOLE   THE CONTRACTION PHASE OF THE CARDIAC CYCLE, DURING WHICH THE HEART IS PUMPING BLOOD OUT TO THE BODY.  
TRICUSPID VALVE   VALVE LOCATED BETWEEN THE RIGHT ATRIUM AND RIGHT VENTRICLE; IT PREVENTS BACKFLOW OF BLOOD INTO THE RIGHT ATRIUM.  
VENA CAVA (PL. VENAE CAVAE)   THE LARGEST VEIN IN THE BODY; ALLOWS DEOXYGENATED BLOOD TO RETURN TO THE HEART;  


   






 
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