1. Cellular Respiration Purpose: create a form of energy useable by the cell Like Getting an Allowance

2. 3 Parts 1. Glycolysis 2. Citric Acid Cycle (Kreb’s Cycle) 3. Electron Transport Chain

3. Glycolysis Takes place in cytoplasm Starts with glucose, NAD and ADP Ends with 2 molecules called pyruvate, NADH, 2 ATP (uses 2 ATP) Doesn’t need Oxygen

4. Kreb’s Cycle (Citric Acid Cycle) Takes place in the mitochondria Requires Oxygen Starts with pyruvate Ends with more NADH, CO2, and FADH2, some ATP

5. Electron Transport Chain Takes place in the mitochondria Makes the majority of the ATP (32) Breaks down NADH and FADH2

6. Fermentation Occurs in the absence of Oxygen Takes place in the cytoplasm 2 types: ◦ Alcohol Fermentation ◦ Lactic Acid Fermentation Goal: Reduce pyruvate; produces NAD+ NAD+ can then go back to glycolysis to produce ATP

7. Fermentation Alcohol Fermentation Lactic Acid Fermentation Occurs in yeasts and some bacteria Product (alcohol) is toxic to the organism Occurs in humans and other mammals Product (lactic acid) is toxic to mammals This is the “burn” felt when exercising

8. Comparison