Cellular Respiration:

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Cellular Respiration

• Presence of oxygen
• Aerobic conditions
• Produces large amounts of ATP
• Occurs in the mitochondria of the cell
• Pyruvate formed from glycolysis is broken down to
  CO2 H2O 36 ATP (products)

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If O2 is present, pyruvate will enter the
mitochondria and enter the following

1. Krebs Cycle
2. Electron transport System

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krebs Cycle

• Pyruvate enters the mitochondria
• Coenzyme A joins with pyruvate forming Acetyle
  CoA, electrons are removed changing NAD to NADH,
  and CO2 is given off
• Acetyle CoA through a series of reactions forms
  Citric acid
• Citric acid gets broken down releasing CO2 and 2
  ATP

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3. Electron Transport System

• Also located in mitochondria
• Electrons that enter the electron transport
  system are carried by electron carrying molecules
• High energy electrons enter the system and low
  energy leave the system
• As electrons pass down the transport system,
  energy is used to make ATP
• Finally, O2 receives the electrons, combines with
  H ions and forms water
• When electron carrier molecules deliver
  electrons, 32-34 ATP are produced

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Summing up the energy yeild from glucose
metabolism

• Glycolysis per glucose molecule, net yield of 2
  ATP
• Krebs cycle per glucose molecule, net yield of 2
  ATP
• Electron Transport System and 32 or 34 ATP
• 36 to 38 ATP total yield per glucose molecule

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• THE END OF HARVESTING ENERGY
• CHAPTER 7