Cellular Respiration

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Cellular Respiration

• How Cells Use Glucose and O2 to make ATP

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I. Equation

• C6H12O6 6O2 ? 6CO2 6H2O ATP
• Glucose Oxygen ? CarbonDioxide Water Energy

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II. Stages of Respiration

1. Glycolysis
2. Citric Acid (Krebs) Cycle
3. Electron Transport Chain

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III. Glycolysis

• Occurs in Cytoplasm
• Does Not require O2 Anaerobic
• Details
• Glucose (6-C) is split into 2 3-C Pyruvic Acids
• 2 ATP are Invested
• 4 ATP are Returned (2 ATP Profit)

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Glycolysis
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IV. 2 Possible Fates for Pyruvic Acid

• A. Citric Acid Cycle
• 1. O2 Required Aerobic
• 2. Occurs in Mitochondria
• 3. More ATP Produced
• B. Fermentation
• 1. Occurs when O2 in not available
• 2. Produces no additional ATP

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V. Fermentation

• A. In Yeast
• 1. Pyruvic Acid is converted to CO2 and Ethyl
  Alcohol
• B. In Muscle
• 1. Pyruvic Acid is converted to Lactic Acid

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Fermentation
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Citric Acid Cycle (needs O2)

• Occurs in Mitochondria
• 1. Pyruvic acid (3-C) gives off CO2
• 2. 2-C product combines with 4-C 6-C
• 3. 2 More CO2 are released ? 4-C again
• 4. Several NADH are produced and sent
  to Electron Transport Chain
• 5. Each NADH makes 3 ATP

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Citric Acid Cycle
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VII. Electron Transport Chain

• Occurs in Mitochondria
• NADHs from Glycolysis and Citric Acid Cycle are
  sent here
• 1. NADHs carry high energy electrons from
  Glucose
• C. Each NADH is used to produce 3ATPs
• 1. 36-38 ATP are produced for each molecule of
  Glucose
• 2. Final electron acceptor is O2

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Electron Transport Chain
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Metabolic Pathways

• All Foods are broken down into building blocks
• All building blocks are processed via cellular
  respiration
• Energy in all foods is used to make ATP

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Metabolic Pathways

• Metabolic Entry Points