Ucla Ekg Test
UCLA EKG TEST 1. electrically polarized at rest: - inside of heart cell has a high potassium concen- tration, whereas the outside has a higher concentration of NA -higher positive charge outside the cell cause more negative charge inside cell 2. electrical potential: difference between the charges outside and inside of the cell wall 3. Depolarization: NA moves into the cell rapidly in response to an electrical im- pulse - inside cell loses negative potential 4. Replolarization: ions return to their original resting state - heart cells restore their resting polarity 5. 4 Phases of Electrophysiology of the heart cell: Phase 0: Na flow in and rapid depolarization occurs when stimulated Phase 1: Rapid return to isoelectric level Phase 2: CA ions flow in and myocytes contract Phase 3: K flow out and rapid depolarization occurs Phase 4: Polarized resting phase 6. Pacemaker cells: - Sinoatrial node ( SA) node -Atrioventricular node )AV node - Purkinjie fibers 7. SA node: -primary pacemaker - Rate: 60-100
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