Cellular Respiration

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Cellular Respiration

• What is it? extracting the energy from glucose
  and using it to charge ADP to make ATP
• Who performs cell respiration?
• One way or another, EVERY LIVING THING

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Cellular Respiration

• How is it done?Aerobic cell respiration
  ORAnaerobic cell respiration
• Purpose is the same, just different methods.

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Cell Respiration - Two types

• - Anaerobic respiration O2 not needed
• - done by yeast, certain bacteria, exhausted
  muscle cells of animals
• - produces 2 ATP per glucose
• - Two steps
• - glycolysis
• - fermentation alcohol or lactic acid

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Step 1

• Glycolysis glucose splitting
• Glucose split into 2 pyruvate
• 2 ATP used
• 4 ATP and 2 NADH made
• Happens in cytoplasm
• First step of BOTH ANAEROBIC AND AEROBIC
  RESPIRATION

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Steps

• Fermentation - conversion of pyruvate to
  Alcohol and CO2 (yeast) or Lactic acid (exhausted
  muscle cells)
• - no more ATP generated
• - Purpose empties electron carriers so
  glycolysis can happen again

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Cell Respiration - Two types

• - Aerobic respiration O2 needed
• Requires mitochondria
• Produces 36 ATP per glucose
• Three steps
• Glycolysis (followed by shuttle step)
• Krebs
• Electron transport Chain

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Overall summary of Aerobic C. R.

• 6O2 ? 6CO2 6H2O
• - getting the energy back out of storage

C6H12O6
ATP
ADP P
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Mitochondria

• Organelle that performs Aerobic respiration

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Step 1

• Glycolysis EXACTLY the same as the beginning of
  anaerobic respiration
• BUT next step is different

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Step 1.5

• Shuttle step converts pyruvate to Acetyl-coA and
  moves it into the mitochondria
• Releases some CO2, fills up some electron carriers

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Step 2

• Krebs cycle fills up electron carriers
• Acetyl CoA broken down to CO2
• 2 ATP, 2 FADH, 6 NADH made PER GLUCOSE
• Happens in mitochondria

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Step 3

• Electron Transport chain
• All the filled electron carriers (NADH, FADH2)
  dump their electrons here
• Energy in electrons is transferred to to make 32
  ATP
• dead Electrons caught by O2 to make H2O

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Steps

• Final Tally See summary sheet!

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Respiration

• What do we notice about respiration in comparison
  to Photosynthesis?

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THE BIG PICTURE
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• Is energy recycled?
• What about the reactants and products??