1. Cellular Respiration

2. Cellular Respiration – mitochondria break down food molecules to produce ATP 3 stages Glycolysis Citric Acid Cycle (Kreb’s Cycle) Electron Transport Chain

3. Glycolysis 2 molecules of ATP needed- 4 produced for net gain of 2 ATP series of chemical rxn’s that break down glucose  2 molecules of pyruvic acid C-C-C-C-C-C  C-C-C + C-C-C Pyruvic acid then moves into the mitochondria Aerobic or Anaerobic Respiration

4. Anaerobic: Fermentation Lactic Acid Fermentation Alcoholic Fermentation

5. Lactic Acid Fermentation Occurs in muscle cells during strenuous exercise Form 2 molecules of lactic acid lactic acid accumulates in the cells increasing the acidity and causing muscle fatigue Lactic acid travels to liver and is converted back to pyruvic acid

6. Alcoholic Fermentation Used by yeast cells and some bacteria to produce CO 2 and ethyl alcohol CO 2 forms bubbles in the dough when making bread basis of the wine and beer industry

7. Aerobic Respiration Krebs Cycle 1. occurs in the mitochondria 2. each turn of the cycle produces 2 molecule of ATP & 2 molecules of CO 2 Electron Transport Chain 1. takes place on the cristae 2. O2 + 4e- + 4H+  2 H2O + 32 ATP

8. Summarizing Cellular Respiration C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + energy Products of photosynthesis are the reactants in cellular respiration Aerobic respiration is not the reverse