Cellular Respiration

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CP Ch 7, TC 5.3

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Cellular Respiration

  1. 1. Cellular Respiration
  2. 2. Cellular Respiration <ul><li>This biochemical process is the slow, controlled breakdown of food for energy. </li></ul><ul><li>This biochemical pathway changes dramatically depending on the presence or absence of oxygen </li></ul>
  3. 3. Glycolysis <ul><li>The splitting of glucose </li></ul><ul><li>First Step </li></ul><ul><li>Common to both pathways </li></ul><ul><li>Requires the input of 2ATP, but results in 4 ATP and 2NADH+ </li></ul>
  4. 4. In the Absence of Oxygen <ul><li>Fermentation is the conversion of pyruvate to either lactic acid or alcohol. </li></ul><ul><li>Must take place in order to continue ATP synthesis from glycolysis </li></ul>
  5. 5. In the Presence of Oxygen <ul><li>Greatly increased efficiency </li></ul><ul><li>Krebs Cycle </li></ul><ul><li>Electron Transport Chain </li></ul>
  6. 6. Krebs Cycle <ul><li>3 Carbon Pyruvate enters </li></ul><ul><li>Pyruvate combines with Acetyl CoA </li></ul><ul><li>CO2, one ATP, 10 NADH+, 2 FADH2 </li></ul>
  7. 7. Electron Transport Chain <ul><li>Uses the electron carriers produced in glycolysis and the Krebs cycle </li></ul><ul><li>Pumps H+ ions across the membrane, against the concentration gradient </li></ul><ul><li>Every electron transfer provides enough energy to pump H+ ions </li></ul>
  8. 9. Another view of the ETC
  9. 10. Total Energy Production <ul><li>38 total ATP in the presence of oxygen </li></ul><ul><li>2 total ATP from fermentation </li></ul>
  10. 11. <ul><li>http://instruct1.cit.cornell.edu/courses/biomi290/ASM/glycolysis.dcr </li></ul><ul><li>http://vcell.ndsu.nodak.edu/animations/etc/movie.htm </li></ul>

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