Cellular Respiration

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Cellular Respiration

• Chapter 9

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2 Types of Respiration

• Aerobic-
• requires oxygen
• Anaerobic-
• does not require oxygen (less efficient)

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Aerobic Cellular Respiration

• Process in which a glucose molecule is broken
  down and the energy it contains is released.

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3 Stages to Cellular Respiration

1. Glycolysis- glucose is partially broken down to
   pyruvate (yields 2 ATP) in cytoplasm
2. Krebs Cycle -pyruvate is completely broken down
   to CO2 and H2O (yields 2 ATP)

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• 3. Electron Transport System- occurs in the
  inner membranes of the mitochondria and produces
  34 ATP

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• Therefore 1 molecule of glucose yields 38 ATP
• in Aerobic Cellular Respiration

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Chemical Equation for Cellular Respiration

• C6H12O6 6O2 ? 6CO2 6 H2O 38 ATP

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Anaerobic Respiration- Fermentation

• Lactic Acid Fermentation-Muscle cells can use
  this for a short time to make ATP in the absence
  of necessary levels of oxygen. This is the reason
  muscles get sore after a workout.

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• Alcoholic Fermentationyeast rely on this type of
  respiration
• Wine and beer contain ethanol made during
  alcoholic fermentation by yeast

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• Both of these forms of anaerobic respiration only
  yield 2 ATP per molecule of glucose, so this type
  of respiration is very inefficient.