Cell resp


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Cell resp

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