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15respiration2007

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  • Which is to say… if you don’t eat, you die… because you run out of energy. The 2nd Law of Thermodynamics takes over!
  • We eat to take in the fuels to make ATP which will then be used to help us build biomolecules and grow and move and… live! heterotrophs = “fed by others” vs. autotrophs = “self-feeders”
  • Movement of hydrogen atoms from glucose to water
  • Movement of hydrogen atoms from glucose to water
  • Transcript

    • 1. Cellular Respiration Harvesting Chemical Energy 2007-2008 ATP
    • 2. Energy needs of life
      • Animals are energy consumers
        • What do we need energy for?
          • synthesis (building)
          • reproduction
          • active transport (pumping)
          • movement
          • temperature control (making heat)
    • 3. Where do we get energy?
      • Energy is stored in organic molecules
        • carbohydrates, fats, proteins
      • Animals eat these organic molecules  food
        • digest food to get
          • fuels for energy (ATP)
          • raw materials for building more molecules
            • carbohydrates, fats, proteins, nucleic acids
    • 4. 2007-2008 ATP What is energy in biology? Whoa ! HOT stuff ! Adenosine Tri Phosphate
    • 5. Harvesting energy stored in food
      • Cellular respiration
        • breaking down food to produce ATP
          • in mitochondria
          • using oxygen
        • usually digesting glucose
          • but could be other sugars, fats, or proteins
      glucose + oxygen  carbon + water + energy dioxide C 6 H 12 O 6 6O 2 6CO 2 6H 2 O ATP  + + + + heat
    • 6. What do we need to make energy?
      • The “Furnace” for making energy
        • mitochondria
      • Fuel
        • food
          • carbohydrates, fats, proteins
      • The Helpers
        • oxygen
          • “ aerobic”
        • enzymes
      Make ATP! Make ATP! All I do all day… And no one even notices! enzymes O 2 food ATP
    • 7. Mitochondria are everywhere!! animal cells plant cells
    • 8. “ Burn fuels” to make energy combustion making heat energy by burning fuels in one step CO 2 + H 2 O + ATP (+ heat ) respiration making ATP energy (& some heat) by burning fuels in many small steps CO 2 + H 2 O + heat fuel (carbohydrates) O 2 ATP food (carbohydrates) O 2
    • 9. Using ATP to do work? A working muscle recycles over 10 million ATPs per second
      • Can’t store ATP
        • too unstable
        • only used in cell that produces it
        • only short term energy storage
          • carbohydrates & fats are long term energy storage
      ATP ADP + P work Whoa ! Pass me the glucose & oxygen ! Adenosine Di Phosphate Adenosine Tri Phosphate
    • 10. A Body’s Energy Budget eat food synthesis (building) storage ATP • resting energy (base level) • activity • temperature control { • growth • reproduction • repair { • glycogen (animal starch) • fat {
    • 11. What if oxygen is missing?
      • Can’t complete aerobic respiration
        • Fermentation
          • alcohol fermentation
            • yeast
              • glucose  ATP + CO 2 + alcohol
              • make beer, wine, bread
          • lactic acid fermentation
            • bacteria, animals
              • glucose  ATP + lactic acid
              • bacteria make yogurt
              • animals feel muscle fatigue
      but only make a little bit of ATP ! O 2
    • 12. 2007-2008 Got the energy… Ask Questions !!

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