Cell resp

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  • 1. Today’s Objective:
    • Given information and/or diagrams on cellular respiration, write and/or identify the cellular respiration equation, raw materials, products, and sites.
    Muhammad Asif Pu Pakistan
  • 2. Cellular Respiration Presented by: Muhammad Asif Energy for life’s activities Muhammad Asif Pu Pakistan
  • 3. Overview of Cellular Respiration
    • The life processes of all organisms require energy.
    • The potential energy held in the bonds of food molecules CANNOT be used directly by the cell.
    • Energy from food must be converted to the ONLY energy source that cells can use ATP!
    Muhammad Asif Pu Pakistan
  • 4. Cellular Respiration
    • Respiration is the process by which the energy in the bonds of nutrients are used to synthesize ATP.
    • Respiration occurs continuously in all cells of all organisms.
    Muhammad Asif Pu Pakistan
  • 5. Anaerobic Respiration
    • Also called fermentation
    • No oxygen is present
    • 1 Glucose only partially broken down to form waste products and 2 ATP
    Muhammad Asif Pu Pakistan
  • 6. Anaerobic Pathways
    • Glucose  2 lactic acid + 2 ATP
      • Happens in muscle cells when they run out of oxygen
      • Happens in bacteria that make yogurt, cheese, dill pickles
    • Glucose  2 ethanol + 2 CO 2 + 2 ATP
      • Happens in some bacteria
      • Happens in YEAST
    Muhammad Asif Pu Pakistan
  • 7. Aerobic Respiration
    • Has to have oxygen
    • VERY EFFICIENT
    • Most organisms on earth are aerobic
    • 1 glucose completely broken down to carbon dioxide and water.
    • C 6 H 12 O 6 + 6 O 2  6 CO 2 + 6 H 2 O + E
    Muhammad Asif Pu Pakistan
  • 8. Aerobic Pathway
    • Takes place mostly in mitochondria
    • 3 primary steps:
      • Glycolysis in cytoplasm : produces pyruvate and 2 net ATP (anaerobic)
      • Kreb’s cycle in matrix of mitochondria : converts pyruvate to Acetyl-CoA (aerobic)
      • Electron transport chain on membrane of mitochondria : moves electrons to produce 34 ATP (aerobic)
    Muhammad Asif Pu Pakistan
  • 9. Comparing Aerobic & Anaerobic Cellular Respiration Pathways Muhammad Asif Pu Pakistan Aerobic (needs oxygen) Anaerobic (no oxygen) Occurs in: Most organisms Mostly yeast and bacteria 1 glucose makes: 6 CO 2 + 6 H 2 O Ethanol + CO 2 or lactic acid Net ATP production: 36 2
  • 10. Adaptations for Respiration
    • Bacteria, protists & fungi
      • Respiratory gases are exchanged by diffusion
    • Plants
      • Respiratory gases are exchanged through leaves, stems, and roots
      • Moves in and out of cells by diffusion but leaves and stems also have openings to the environment (stomata and lenticels)
    Muhammad Asif Pu Pakistan
  • 11. Adaptations for Respiration in Animals
    • Techniques vary:
      • Simple diffusion across cell membranes
      • Diffusion across moist skin into a circulatory system
      • Openings to the environment that can be flapped open and closed with a circulatory system to transport gases
      • Specialized respiratory structures (e.g. lungs) to speed exchange of respiratory gases
    Muhammad Asif Pu Pakistan