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A&P 2 EKG
Electrocunduction of the Heart and EKG
| Question | Answer |
|---|---|
| SA NODE (sinoatrial node) | located in rt atrium spontaneous depolarization (electrochemical stimulus) controls rhythm of electrical pulse |
| AV NODE (atrioventricular node) | located in interatrial septum specialized cardiac cells controls rate of contraction |
| ATRIOVENTRICULAR BUNDLE (bundle of HIS) | located in interventricular septum cunducts impulses through septum from AV to bundle branches |
| PURJINKE FIBERS | located in ventricles depolarizes cells of ventricles |
| P WAVE | atrial depolarization |
| QRS WAVE COMPLEX | ventricular depolarization hides atrial repolarization |
| T WAVE | ventricular repolarization |
| CARDIAC CYCLE | period from one contraction to the next about .8 seconds |
| SYSTOLE | cardiac contraction heart ejects blood V constriction .3 secs |
| DIASTOLE | cardiac rest heart fills with blood V constriction .5 secs |
| TACHYCARDIA | HR over 100 bpm |
| BUNDLE BRANCHES | located in interventricular septum cunducts impulses through septum from bundle of HIS to ventricles |
| A FIB (AF) | P wave problem irregular heartbeat |
| V FIB | all waves unreadable |
| BUNDLE BRANCH BLOCK (BBB) | wide QRS complex split peak of Q wave |
| AV NODE DELAY (heart block) | PQ interval of <.24 seconds or non existant P wave |