krebs cycle and electron transport chain section 9-2
TRANSCRIPT
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Krebs Cycle and Electron Transport Chain
Section 9-2
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Krebs Cycle
• Location: matrix of mitochondria.• First, pyruvic acid is broken down into
Acetyl Co-enzyme A and then into Citric Acid.
• CO2 is produced• Electron carriers produced: FADH2 and
NADH.• Net of 2 ATP are formed. (1 from each
pyruvic acid from glycolysis)
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Section 9-2Krebs Cycle
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Krebs Cycle
• Reactants:– Pyruvic Acid becomes
Acetyl Co-A becomes
Citric Acid
– NAD+ and FAD+ used
– ADP used
• Products:– CO2 produced
– NADH and FADH2 produced
– ….NET 2 ATP PRODUCED!
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Electron Transport Chain• Location: cristae (inner membranes) of the
mitochondria.• The electron carriers (NADH and FADH2)
release their high energy electrons to carrier proteins.
• H+ ions move through ATP channel to generate the ATP.
• Oxygen is the final electron acceptor in the chain and combines with the H+ ions = H2O.
• Net total of 32 ATP.
Animation
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Section 9-2
Electron TransportHydrogen Ion Movement
ATP Production
ATP synthase
Channel
Inner Membrane
Matrix
Intermembrane Space
Mitochondrion
ETC
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ETC
• Reactants:– NADH and FADH2
release electrons and H+ ions which move through ATP synthase…
– Electrons added to H+ and O2 …
• Products:– NAD+ and FAD+
produced
– …producing ATP
– …forming H2O
NET 32 ATP
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Energy and Exercise
ATP in muscles and Creatine Phosphate to generate more ATP
Lactic Acid Fermentation
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CO2 and H2O C6H12O6 and O2
CC6H12O6 and O2 CO2 and H2O
6CO2 + 6H2O C6H12O6 + 6O2 6O2 + C6H12 O6 6H20 + 6CO2
Chloroplasts Mitochondria