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What If There’s No Oxygen?

  • There are times, such as during heavy exercise, when cells are WITHOUT Oxygen for short periods.

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  • Anaerobic respiration begins.
    • Also called Fermentation.

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    • Occurs after Glycolysis in the cytoplasm when there is NO Oxygen.

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    • Provides a way to make ATP from food until Oxygen is available again.

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Anaerobic Respiration (Fermentation)

  • Two Types
    • Lactic Acid Fermentation

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      • Uses two NADH to change Pyruvate (pyruvic acid) into Lactic Acid and energy (ATP).�
      • Only happens if cells need more energy than can be produced by Glycolysis and NO Oxygen is present. �
      • Happens in muscle cells after strenuous exercise, which causes pain, soreness, fatigue.

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Anaerobic Respiration (Fermentation)

  • Two Types
    • Alcoholic Fermentation

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      • Occurs in yeast cells.�
      • Pyruvate (pyruvic acid) from Glycolysis is converted to Carbon Dioxide, Ethyl Alcohol, and energy (ATP).�
      • Used in bread, beer and wine production.

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Anaerobic Respiration (Fermentation)

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Comparing Photosynthesis & Cellular Respiration

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Photosynthesis

Cellular Respiration

Function

Capture Energy in Glucose

Releases Energy from Glucose (ATP)

Location

In Chloroplasts

In Mitochondria

Reactants �(start with)

CO2, H2O, Light

C6H12O6 & O2

Products�(end with)

C6H12O6 & O2

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CO2, H2O, ATP

Occurs in

Autotrophs ONLY

Autotrophs AND Heterotrophs

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C6H12O6