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Zusammenfassung Zellatmung

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Zellatmung; Glykolyse, Citratzyklus, Atmungskette, Gärung

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Institution
Secondary school
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Gymnasium
Course
School year
1

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Uploaded on
April 3, 2023
Number of pages
4
Written in
2021/2022
Type
Summary

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Zellatmung

Dissimilation
=> Umwandlung energiereicher körpereigener Stoffe in energieärmere Stoffe
→ Energie frei gesetzte (ATP) & als Wärme nutzbar
- wird für diese Umwandlung Sauerstoff benötigt spricht man von Zellatmung
=> Glucose vollständig zu Kohlenstoffdioxid & Wasser oxidiert:
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
Teilschritte Glucoseabbau:
1. Glykolyse im Cytosol
2. Citratzyklus in der Mitochondrienmatrix
3. Atmungskette im inneren der Mitochondrienmembran

1. Glykolyse
• aus Glucosemolekül (C6-Körper) zwei Moleküle Pyruvat (C3-Körper)
• Zwei Reaktionen benötigen Energie: Bildung von Glucose-6-Phosphat aus Glucose
(reaktionsträge) & Fructose-6-Phosphat zu Fructose-1,6-bisphosphat → 2 ATP-Moleküle
verbraucht => Energieinvestitionsphase
• entstehen zwei Triosephosphate: Glycerinaldenhyd-3-Phosphat (GAP) &
Dihydroxyacetonphosphat (jeweils C3-Körper)
• die Oxidation von GAP zu 1,3-Bisphosphpglycerat, dabei wird H2O & ein P gebunden, ist
mit der Reduktion von NAD+ zu NADH+H+ gekoppelt
• das wird zu 3-Phosphoglycerat, dabei wird 2 ADP zu 2 ATP
• das zu 2-Phosphoglycerat, das zu Phosphoenolpyruvat dabei spaltet H2O ab
• Phosphoenolpyruvat wird zu Pyruvat (C3-Körper), hiebei werden 2 ADP zu 2 ATP
• bei Dihydroxyacetonphosphat gleicher Ablauf
• Bilanz: Glucose+ 2NAD+ + 2ADP + 2 P → 2 Pyruvat+ 2 NADH+H+ +2 ATP
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