UCLA EKG test 2025| Answered 100% Correctly
UCLA EKG test 2025| Answered 100% Correctly electrically polarized at rest - inside of heart cell has a high potassium concentration, whereas the outside has a higher concentration of NA -higher positive charge outside the cell cause more negative charge inside cell electrical potential difference between the charges outside and inside of the cell wall Depolarization NA moves into the cell rapidly in response to an electrical impulse - inside cell loses negative potential Replolarization ions return to their original resting state - heart cells restore their resting polarity 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 Pacemaker cells - Sinoatrial node ( SA) node -Atrioventricular node )AV node - Purkinjie fibers SA node -primary pacemaker - Rate: 60-100 - SA node depolarizes the atria via intro nodal tracts and Bachmann;s bundle = resulting in atrial contraction AV node
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