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Cellular respiration-real life

Cellular respiration-real life

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Cellular respiration-real life

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  1. Cellular respiration-real life • So far we’ve looked at glucose entering into cellular respiration... But what about proteins, carbs, fats & lipids? They give us energy too right? • We need to eat a balanced diet -fats/lipids: essential for use of fat soluble vitamins in our food to be used... • Proteins help build muscle, etc. • These enter the metabolic process at different stages.

  2. Varied diet and metabolic pathways Nutrients enter the metabolic process at different stages. • Proteins Amino acids pyruvate or krebs intermediate • Carbos sugars glucose Glycerol G3P (in glycolysis) • Fats Fatty acids acetyl CoA

  3. deamination

  4. Video on breakdown during aerobic extercise http://www.youtube.com/watch?v=PQMsJSme780&feature=related

  5. Anaerobic respiration

  6. Cellular Respiration: The Big Picture Photoautrophheterotrophchemoautotrophwe all do it!

  7. Cellular Respiration: The Details

  8. Related Pathways

  9. Fermentation occurs in the ABSENCE OF OXYGEN. LACTIC ACIDFERMENTATION or ALCOHOLIC FERMENTATION.

  10. Aerobic respiration Yields 36 ATP/glucose Produces CO2 and water Fermentation Yields 2 ATP/glucose Produces ethanol or lactic acid

  11. Anaerobic Pathways • When oxygen is not available • Eukaryotes still carry out glycolysis by transferring the H atoms in NADH to pyruvate • The NAD+ molecules formed allow glycolysis to continue

  12. Ethanol (Alcohol) Fermentation Occurs in yeast cells and is used in wine, beer, and bread making

  13. Ethanol (Alcohol) Fermentation • A molecule of CO2 is removed from pyruvate, forming a molecule of acetaldehyde • The acetaldehyde is converted to ethanol by attaching H from NADH • FINAL PRODUCTS: ATP, CO2, ethanol • http://trc.ucdavis.edu/biosci10v/bis10v/media/ch06/fermentation.swf

  14. A particular organism releases carbon dioxide and alcohol as its end products. The organism is most likely which of the following? a. an animal b. an alga c. a green plant d. a yeast e. a virus d. a yeast

  15. Anaerobic and aerobic respiration are similar in all but one of the following ways. Which one is the exception? A) NAD+ is reduced B) carbon dioxide is a product C) ADP is combined with inorganic phosphate to form ATP D) acetaldehyde is converted into ethanol E) both can release energy from glucose D) acetaldehyde is converted into ethanol

  16. Lactate (lactic acid) fermentation • Occurs in animal muscle cells during strenuous exercise • FINAL PRODUCTS: ATP, lactate

  17. What happens to lactic acid after it is formed in a muscle cell? • Lactic acid travels in the bloodstream to the liver, where it is oxidized back to pyruvate, which then goes through the Krebs cycle and oxidative phosphorylation. • The presence of lactic acid in the muscle tissues leads to stiffness, soreness, and fatigue.

  18. Oxygen debt • Oxygen debt refers to the extra oxygen required by the liver to oxidize lactic acid to CO2 and water (through the aerobic pathway) • Panting “pays” for the oxygen debt

  19. During active exercise, the supply of oxygen becomes inadequate for the level of activity you are attempting to maintain. How do the catabolic reactions of the cell continue? • Glycolysis continues to supply small amount of ATP, and the pyruvate that normally would continue on the Krebs cycle as acetyl-CoA is instead converted to lactate to regenerate NAD+ to allow glycolysis to continue.

  20. VO2 max and the Lactate Threshold • The maximum oxygen uptake (VO2 max) is the maximum volume of oxygen that the cells of the body can remove from the bloodstream in one minute per kg of body mass while the body experiences max. exertion. • The lactate threshold (LT) is the value of exercise intensity at which blood lactate concentration begins to increase sharply.

  21. Overview of Cellular Respiration which occurs in STAGE 1: GLYCOLYSIS STAGE 2: TWOMAIN PATHWAYS, DEPENDING ON WHETHER THERE IS OXYGEN IN THE CELL.

  22. Aerobic Respiration produces nearly 20 times as much ATP as isproduced by Glycolysis alone.

  23. Anaerobic respirationRead and make notes134-137 and answer #1-8 pg 137