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41
Aktionspotenzial
1. Ruhepotenzial: -70 mV
2. Öffnung einiger Na+-Kanäle
3. Öffnung weiterer Na+-Kanäle
4. Öffnung K+-Kanäle & beginnende Schließung Na+
5. Schließung K+Kanäle
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2. Öffnung einiger Na+-Kanäle
- Beginn Depolarisation
- Diffusion Na+ nach innen
- Spannung wird geringer
3. Öffnung weiterer Na+-Kanäle
- Schwellenwert -50 mV
- spannungsgesteuerte Ionenkanäle
- Diffusions- und elektrostatisches Potenzial: Na+ ins Innere
- fortschreitende Depolarisation
- Umkehr der Ladung 30 mV
4. Öffnung K+-Kanäle & beginnende Schließung Na+
- spannungsgesteuerte Kaliumkanäle
- K+ strömen nach außen
- Repolarisation bis Hyperpolarisation (-75 mV)
- langsamer als Na+
5. Schließung K+Kanäle
- Na+K+Ionenpumpen stellen ursprüngliches Verhältnis wieder her
- Ruhepotenzial
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Tags: 3. Semester, Biologie, Neurophysiologie
Source:
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Flashcard info:
Author: sternchenEtoile
Main topic: Biologie
Topic: Abiturwissen
Published: 27.03.2013
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