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Cellular Respiration 7.5

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Cellular Respiration

I. Glycolysis

II. Kreb’s Cycle

III. Electron Transport Chain

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I. Glycolysis

Occurs in cytoplasm

Starts w/:

6 C sugar (glucose)

2 ATP

Ends w/:

2, 3 C pyruvic acids

2 NADH (to E.T.C.)

4 ATP (two useable)

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II. Kreb’s Cycle

In mitochondria’s matrix

Starts w/

Pyruvic acid and H2O Acetyl CoA (acetyl coenzyme A)

Ends w/

4 NADH (to E.T.C.)

1 FADH2 (to E.T.C.)

3 CO2(g)

1 ATP

Cycle spins twice!!!

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… totals so far …

ATP

4 or 6

NADH

10

FADH2

2

6

III. Electron Transport Chain

In mitochondria’s inner

membrane

NADH and FADH2 releasing e-

e- “fall” to O

ATP generated

H+ O2 and e- form . . .

Water

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Electron Transport Chain cont’

Each NADH produces 3 ATP

Each FADH2 produces 2 ATP

10 NADH x 3 ATP =

30 ATP

2 FADH2 x 2 ATP =

4 ATP

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Final Totals of Cellular Respiration:

Glycolysis

2 ATP (4)

Kreb’s

2 ATP

ETC

~ 34 ATP

~ 38 ATP

per one molecule of glucose

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Cellular Respiration Equation

C6H12O6 + 6O2 6CO2 + 6H2O + ATP’s

ATP ADP + Phosphate + Energy

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Fermentation

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Fermentation

Occurs when little or no O2 is available

“Choice” to generate ATP:

Glycolysis

Fermentation . . .

Cellular Respiration

“aerobic”

“anaerobic”

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Fermentation: Muscle and Microorganism

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