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Cellular Respiration Thurs 9 / 12 /13 &

Cellular Respiration Thurs 9 / 12 /13 & . Tues 9/17/13. Finish up Basic Energy / ATP outline Cellular Respiration exchange of gases three stages of cellular respiration input & output of stages // recycling of molecules how ATP is formed // role of oxygen.

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Cellular Respiration Thurs 9 / 12 /13 &

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  1. Cellular Respiration Thurs 9/12/13 & Tues 9/17/13 • Finish up Basic Energy / ATP outline • Cellular Respiration • exchange of gases • three stages of cellular respiration • input & output of stages // recycling of molecules • how ATP is formed // role of oxygen

  2. Cellular Respiration:

  3. Cellular Respiration & Breathing: • cellular respiration takes place at level of cells • cells need • cells • respiratory system • circulatory system see fig 15.9

  4. Stages of Cellular Respiration: • 4 stages -- • aerobic -- • takes place in mitochondrion • glycolysis (cytoplasm) • prep reaction (matrix) • citric acid cycle (matrix) • electron transport chain (membrane)

  5. Cellular Respiration -- harvesting energy through the exchange of gases (O2 --> CO2) • requires oxygen • each stage • molecules need • w/o oxygen • e.g., • in the absence of oxygen -

  6. energy stored Glycolysis: • splitting of sugar molecule • energy-investment steps • energy fig 7.4

  7. Glycolysis: • potential energy stored in • additional energy stored in • pyruvate - • NADH - fig 7.4

  8. Production on ATP -- (1st way): • Substrate-level ATP synthesis • stripping • formation of new bond - • occurs in pg116

  9. Preparatory reaction: Pyruvate Oxidation • Pyruvate is oxidized • convert to CoAw/ two carbon attached (Acetyl-CoA) • Acetyl-CoA channeled to: pg 118

  10. Citric Acid Cycle • Note: • two acetyl-CoA molecules fig. 7.5

  11. Citric Acid Cycle understand fig. 7.5 • start with Acetyl-CoA • two carbons added to 4-carbon molecule • 6-C converted to 5-C • 5-C converted to 4-C

  12. Production on ATP – 2nd wayvia Electron Transport Chain fig 7.6b • transfer of electrons • series of • energy can be fig 7.3

  13. Production on ATP via Electron Transport Chain • electron carriers within membrane • accept: • energy given off • build up concentration • ATP synthase channel opens fig 7.7

  14. fig 7.7 Electron Transport Chain: • kinetic energy of movement of H+ • oxygen is the • W/O oxygen • ATP Note:

  15. Cellular Respiration Overview: • Glycolysis: • Inputs: • Outputs: 2 Pyruvate, • Pyruvate Oxidation • Inputs: 2 Pyruvate, • Outputs: Acetyl-CoA, • Krebs Cycle: • Inputs: Acetyl-CoA (2-C), • Outputs: • Electron Transport: • Inputs: • Outputs:

  16. Anaerobic Respiration - • Fermentation: • produces • Pyruvate is the • NAD+ is in • NADH carries • e- donated to • O2 is final

  17. Anaerobic Respiration - • alcoholic & lactic acid fermentation - • Humans: • In presence of O2 • muscle burn see fig 7.9

  18. Anaerobic Respiration - • Yeast: • can carry out • in anaerobic environments • by products are see fig 7.9

  19. Energy can be extracted from more than just glucose. • polysaccharides • proteins • monoglycerides and fatty acides Not Just Glucose reactions reversible

  20. Biosynthesis pathways -- benefit of food - other than fuel: • food is the raw material for new molecules • consume ATP --

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