Cellular Respiration (2)

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  • Cellular Respiration
    • The process that releases energy from food in the presence of oxygen.
      • 6O2 + C6H12O6 --> 6CO2 + 6H2O+ energy
        • Oxygen + Glucose --> Carbon Dioxide + Water + Energy
    • It has 3 stages: Glycolysis, the Krebs Cycle and the electron transport chain.
      • Glucose enters a chemical pathway known as glocolysis. Only 10% is converted to ATP, the rest becomes pyruvic acid.
        • Pyruvic acid then enters the Krebs Cycle where a small amout of energy is released.
          • The last  stage is the electron transport chain. It requires reactants from the first two stages and uses oxygen to extract energy.
      • Glycolysis occurs in the cytoplasm and the Krebs cycle and electron transport chain occurs in the mitochondria.
    • Oxygen and Enegy
      • Pathways that require oxygen are said to be aerobic like the Krebs cycle and the electron transport chain
      • Pathways that do not need oxygen are said to be anaerobic like glycolysis.
    • Photosynthesis removes carbon dioxide from the atmosphere and respiration puts it back. Photosynthesis releases oxygen in to the atmosphere and respiration uses it to release energy from food.


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