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29 Cards in this Set

  • Front
  • Back
2 FUNCTIONS OF THE HEART
1) RECEIVE BLOOD AT LOW PRESSURES DURING DIASTOLE
2) EXPEL BLOOD TO ALL AREAS OF THE BODY
MYOCARDIUM RECIEVES OXYGENATED BLOOD FROM THE
_________ AND _________
CORONARY ARTERIES.
RT AND LEFT
THE CORONARY SINUS EMPTIES INTO...
THE RT ATRIUM
DEOXYGENATED BLOOD RETURNS TO THE RIGHT ATRIUM VIA THE...
SVC AND IVC
AUTOMATICITY
THE ABILITY TO GENERATE AN ELECTIRCAL IMPULSE
EXCITABILITY
THE ABILITY TO RESPOND TO AN IMPULSE
CONDUCTIVITY
THE ABILITY TO TRANSMIT IMPULSE FROM CELL TO CELL
CONTRACITLITY
ABILITY OF MYOCARIAL CELSS TO CONTRACT IN RESPONSE TO AN IMPULSE
EXTENSIBILITY
THE ABILITY OF MUSCLE CELLS TO STRETCH AS THE CHAMBERS OF THE HEART FILL WITH BLOOD
SA NODE
PM OF THE HEART
WALL OF THE RT ATRIUM AT THE JUNCTION OF THE SVC
INITIATES IMPULSES AT RATE OF 60-100/MIN
SA NODE TRANSMITS IMPULSE THRU THE ATRIA VIA
INTERNODAL PATHS OR TRACTS
(CONNECT SA TO AV NODE)
SA NODE BLOOD SUPPLY
RCA - 60%
LEFT CIRCUMFLEX - 40%
AV NODE
RCA - 90%
LEFT CIRCUMFLEX - 10%
BUNDLE OF HIS
LAD
POSTERIOR DESCENDING BRANCH OF RCA
LEFT BUNDLE BRANCH
POSTEROIR FASCICLE

ANTERIOR/MIDDLE FASCICLES
LAD, POST DESC BRANCH OF RCA

SEPRAL PERFORATING BRANCES OF LAD
RIGHT BUNDLE BRANCH
RCA AND LAD
AV JUNCTION
MADE OF ATRIAL APPROACHES TO THE AV NODE, AV NODE, NON-BRANCHING PORTIONS OF BUNDLE OF HIS.
INHERENT RATE 40-60/MIN
PACEMAKER CELLS IN THE PURKINJE FIBERS WILL GENERATE
AN IMPULSE UP 40 TIMES PER MINUTE SHOULD BOTH THE SA AND JUNCTION FAIL TO GENERATE IMPULSES.
POLARIZED
CELL RESTING
MORE (-) CHARGES INTRACELLULARY
MORE (+) CHARGES ON THE OUTSIDE
DEPOLARIZED
WHEN ACTIVATED, MORE (+) INSIDE, OUTSIDE IS MORE (-)
DUE TO THE MVMT OF NA IONS INTO THE CELL
REPOLARIZED
WHEN NA+ MOVES OUT OF THE CELL, THE INSIDE OF THE CELL BECOMES MORE (-)
PHASE 1 CALCIUM MOVES INTO THE CELL WHILE POTASSIUM MOVES OUT
PHASE 2 SODIUM AND CALCIUM MOVE INTO THE CELL, K MOVES OUT
PHASE 3 K MOVES RAPIDLY FROM THE CELL
PHASE 4 SODIUM AND CALCIUM RETURN TO THE OUTSIDE, K MOVES BACK IN. AT THE END, THE CELL IS POLARIZED.
PRI interval
beginning of the p wave to the beginning of the QRS complex
0.12 to 0.20 seconds
PR segment
the end of the p wave to the beginning of the QRS
the amount of time is take the impulse to be delayed in the AV node
QRS
width represents the amt of time it take to depolarize the ventricles
normal: 0.10 sec
ST SEGMENT
the start of ventricular repolarization
J point
the point at which the ST segemnt leaves the complex
QT interval
the length of time it takes the ventricles to de/repolarize
time varies with age, gender, HR
U wave
seen best in V1-V4
usually prominent in HYPOKALEMIA
0
.