Cellular Respiration

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Chapter 9

• Cellular Respiration

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Cellular Respiration

• The process that releases energy by breaking down
  glucose and other food molecules in the presence
  of oxygen.
• 6 O2 C6H12O6 ? 6 CO2 6 H2O Energy
• oxygen Glucose ? carbon
  water energy
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  dioxide
• Uses energy to produce ATP
• Aerobic requires oxygen
• Occurs in the mitochondria

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Fermentation

• Fermentation releases energy from food
  molecules by producing ATP in the absence of
  oxygen
• Anaerobic does not require oxygen
• Alcoholic Fermentation
• Used by yeast and other microscopic organisms
• Produces CO2 and alcohol
• Causes bread dough to rise

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Fermentation cont.

• Lactic Acid Fermentation
• Produces lactic acid
• Produced in your muscles during rapid exercise
  when the body cannot supply enough oxygen to the
  tissues.
• Causes muscles to feel a painful, burning
  sensation

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Glycolysis

• The first set of reactions in cellular
  respiration.
• Does not require oxygen.
• Uses 2 ATP molecules during the process, but
  produces 4 ATP molecules. This gives the cell a
  net gain of 2 ATP molecules.
• Glucose is broken down into 2 molecules of
  pyruvic acid.

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Glycolysis cont.

• Captures two pairs of electrons with
• the carrier NAD.
• NADH holds the electrons until they
• can be transferred to other
• molecules.

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Comparing Photosynthesis and Cellular Respiration
Photosynthesis Cellular Respiration
Function Captures energy Releases energy
Location Chloroplasts Mitochondria
Reactants CO2 H2O C6H12O6 O2
Products C6H12O6 O2 CO2 H2O
Occurs in Autotrophs only Both Autotrophs and Heterotrophs
Photosynthesis and Cellular Respiration are
opposites of each other.