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Cellular Respiration Biology What does this remind you of? Cellular Respiration n The process that releases energy by breaking down glucose n Occurs in ALL living cells n Chemical Formula for respiration C6H12O6 + O2 à CO2 + H2O + ATP n Glucose + Oxygen à Carbon Dioxide + Water + ATP Aerobic Cellular Respiration Uses Oxygen n Releases energy Occurs in 3 stages: n 1. GLYCOLYSIS 2. KREBS CYCLE 3. E- TRANSPORT CHAIN Overview: Aerobic Respiration Step 1: Glycolysis n Occurs in the cytoplasm (fluid surrounding cell organelles) Glucose is converted (changed) into pyruvic acid (1 glucose = 2 pyruvic acids) ¨ 2 ATP molecules are produced ¨ Step 2: Krebs Cycle (aka Citric Acid Cycle) n Occurs in mitochondria n Pyruvic acid from glycolysis is broken down into CO2 n 1 molecule of ATP is produced for each pyruvic acid (total of 2) Electron Transport Chain n The Krebs Cycle generates high-energy electrons that are passed to the electron transport chain n Here they are used to change ADP to ATP n Water is formed Totals for Aerobic Respiration n Production of 36 ATP molecules n Heat is also released ¨ this is why you feel warm after you exercise Anaerobic Cellular Respiration n Does not use Oxygen n Releases energy n Occurs in 2 steps 1. Glycolysis 2. Lactic Acid Fermentation OR 2. Alcoholic Fermentation Lactic Acid Fermentation n Lactic Acid is produced n Sore muscles after a workout n How bacteria makes yogurt Alcoholic Fermentation n Ethyl alcohol is produced n How yeast makes bread Totals for Anaerobic Respiration n Anaerobic Cellular Respiration produces a total of 2 ATP molecules