CELLULAR RESPIRATION Chapter 5 Section 3. Cellular Respiration  Occurs in all organisms when Oxygen is available.  Converts Food Energy  ATP  Two.

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Presentation transcript:

CELLULAR RESPIRATION Chapter 5 Section 3

Cellular Respiration  Occurs in all organisms when Oxygen is available.  Converts Food Energy  ATP  Two types of Cellular Respiration  Aerobic = with O 2  Anaerobic = without O 2 C 6 H 12 O 6 + 6O 2  6 H 2 O + 6 CO 2 + ATP

Stages of Cellular Respiration 1. Glycolysis 2. Transition Step 3. Krebs Cycle (Citric Acid Cycle) 4. Electron Transport Chain

1. Glycolysis: biochemical pathway that occurs in Cytoplasm 2 ATP 2 ADP + P 4 ATP 4 ADP + 4 P 2 NAD + 2 NADH

2. Transition Step: biochemical pathway in Mitochondria  Both Pyruvates are converted to Acetyl-CoA  CO 2 and NADH are released

3. Krebs Cycle

3. Krebs Cycle: outer membrane of Mitochondria 2ATP 2ADP + 2P

4. Electron Transport Chain: Inner membrane of Mitochondria Proton Pumps ATP Synthetase

4. Electron Transport Chain: Inner membrane of Mitochondria Proton Pumps ATP Synthetase ATP ADP + P

4. Electron Transport Chain: Inner membrane of Mitochondria

 NADH & FADH 2 drop off high energy e - /H  high energy e - /H power proton pumps in mitochondria  Creates concentration gradient  ATP  “used up” e - /H combines with O 2  H 2 O

Anaerobic Respiration: Fermentation  Occurs when your cells are burning sugar faster than you can bring in the O 2.  2 types of fermentation  Lactic Acid (animals)  Alcoholic (fungus/yeasts)

Fermentation and the Electron Transport Chain:

Fermentation and the Krebs Cycle 2ATP 2ADP + 2P

Fermentation and the Transition Step  Both Pyruvates are converted to Acetyl-CoA  CO 2 and NADH are released

Why do we need Fermentation?  If your cells can’t recycle the NAD + then…  ETC shuts down  Krebs Cycle Shuts down  Stuck with pyruvate = death

Then what happens next?  Fermentation recycles NADH  NAD +  Converts pyruvate to a new product (lactic acid) and allows NAD + to keep Glycolysis going = We Stay ALIVE!!!

Anaerobic Respiration: Lactic Acid Fermentation ATP ADP NAD + NADH

Anaerobic Respiration: Alcoholic Fermentation ATP ADP NAD + NADH

Cellular Respiration Overview Anaerobic (without O 2 ) Aerobic (with O 2 ) 2 ATP 34 ATP