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Cellular Respiration

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Cellular Respiration Unit 3: Energize Your Life Chapter 9 Chemical Energy from Food Cells have to convert food into chemical energy. Cellular respiration releases ... – PowerPoint PPT presentation

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Title: Cellular Respiration


1
Cellular Respiration
  • Unit 3 Energize Your Life
  • Chapter 9

2
Chemical Energy from Food
  • Cells have to convert food into chemical energy.
  • Cellular respiration
  • releases energy by breaking down food molecules
    in the presence of oxygen.
  • This occurs in the mitochondria.

3
Cellular Respiration
  • Equation
  • 6O2 C6H12O6 ? 6CO2 6H2O E
  • There are 3 stages of cellular respiration
  • Glycolysis
  • The Krebs Cycle
  • Electron Transport Chain

4
Glycolysis
  • 1 molecule of glucose (C6H12O6) is broken in half
    into 2 molecules of pyruvic acid.
  • Does NOT require oxygen.
  • Occurs in the cytoplasm.
  • NAD is an electron carrier that makes ATP.
  • Glycolysis net gain of 2 ATP

5
If Oxygen Is NOT Present
  • After glycolysis, the cell goes into
    Fermentation.
  • Fermentation releases energy from food in
    anaerobic (without oxygen) conditions.
  • 2 Types alcoholic fermentation lactic acid
    fermentation

6
If Oxygen Is Present
  • O2 is present after glycolysis Krebs Cycle
  • Pyruvic acid (produced by glycolysis) is broken
    down into CO2
  • Krebs Cycle occurs in the mitochondria

7
Products of the Krebs Cycle
  • From one molecule of pyruvic acid
  • 3 molecules of CO2
  • 4 NADH (electron carrier)
  • 1 FADH2 (electron carrier)
  • 1 molecule ATP
  • 2 molecules total of pyruvic acid are broken down

8
Electron Transport Chain
  • Electrons are passed from NADH and FADH2
    (produced in Krebs) through the electron
    transport chain.
  • ETC uses these electrons to convert ADP into ATP.
  • Oxygen is necessary to rid the wastes produced.

9
Electron Transport Chain
  • Each pair of electrons passed down the ETC
    provides enough energy to convert 3 ADP into 3
    ATP.
  • From the Krebs Cycle
  • 8 NADH produce 24 ATP
  • 2 FADH2 produce 4 ATP
  • 2 NADH from glycolysis produce 4 ATP

10
End Results
  • The complete breakdown of glucose through
    cellular respiration (including glycolysis)
    results in the production of 36 ATP molecules.
  • Glycolysis 2 ATP
  • Krebs Cycle 2 ATP
  • Electron Transport Chain 32 ATP
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