Energy and Life

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Energy and Life

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  1. Energy and Life

    Slide 1 - Energy and Life

  2. Review

    Slide 2 - Review

    • Each part of the cell is responsible for a specific job:
    • Cell membrane: TRANSPORT (diffusion, osmosis, facilitated diffusion, active transport)
    • Mitochondria: CELLULAR RESPIRATION
    • Chloroplasts: Photosynthesis
  3. METABOLISM

    Slide 3 - METABOLISM

    • All living things have a metabolism. METABOLISM is the process of converting food into energy.
    • The energy in food is measured in CALORIES.
    • Certain foods (like fats) are higher in calories and therefore contain more energy
    • Calories not used are stored
  4. Site of Metabolism

    Slide 4 - Site of Metabolism

    • In eukaryotic cells, most metabolism occurs in the mitochondria.
  5. PROBLEM:

    Slide 5 - PROBLEM:

    • Your body cannot use energy from food directly!
    • Too much energy would be released at once
  6. ATP

    Slide 6 - ATP

    • ATP is the only useable form of energy for living things.
    • Energy from the food we eat must be converted (or changed) into ATP.
    • ATP is like a fully-charged battery. As it loses its charge, it is chemically changed into another chemical called ADP.
  7. Battery Analogy:

    Slide 7 - Battery Analogy:

  8. ATP-ADP Cycle

    Slide 8 - ATP-ADP Cycle

  9. CELLULAR RESPIRATION

    Slide 9 - CELLULAR RESPIRATION

    • Cellular respiration is the process that living things use to convert glucose (a sugar) into useable energy: ATP!
  10. REACTANTS (things needed)

    Slide 10 - REACTANTS (things needed)

    • Glucose (C6H12O6)…
    • Comes from carbohydrates
    • Oxygen (O2)…..
    • Comes from the air (breathing)
  11. PRODUCTS (things made)

    Slide 11 - PRODUCTS (things made)

    • ATP…
    • used for energy!
    • Carbon dioxide (CO2)…
    • exhaled as waste
    • Water (H2O)…
    • exhaled or excreted as waste
  12. OVERALL EQUATION FOR CELLULAR RESPIRATION:

    Slide 12 - OVERALL EQUATION FOR CELLULAR RESPIRATION: