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Cell Energy: Cellular Respiration

Cell Energy: Cellular Respiration. Cellular Respiration. Definition: The process where stored energy is converted to a usable form. Oxygen and glucose are converted to carbon dioxide, water, and ATP. Cellular Respiration Equation. (Opposite of photosynthesis)

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Cell Energy: Cellular Respiration

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  1. Cell Energy: Cellular Respiration

  2. Cellular Respiration • Definition: The process where stored energy is converted to a usable form. • Oxygen and glucose are converted to carbon dioxide, water, and ATP.

  3. Cellular Respiration Equation • (Opposite of photosynthesis) O2 + C6H12O6 CO2 + H2O + ATP (oxygen) + (glucose)  (carbon dioxide) + (water) + (energy) Reactants Products

  4. Who performs cellular respiration? • All organisms!!!

  5. Why is cellular respiration important? • Cellular respiration is the process organisms use to obtain energy from the food they eat. • Cells use the energy from cellular respiration for growth, repair, and maintenance.

  6. Processes involved • Glycolysis • Aerobic Respiration • Kreb’s Cycle/Citric Acid Cycle • Electron Transport Chain (ETC)

  7. Glycolysis (“Glucose-Breaking”) • Takes place in the cytoplasm • The glucose molecule is broken into two pieces. • Glucose is converted to pyruvic acid: this conversion produces 2 ATP molecules.

  8. Aerobic Respiration • “Aerobic” means “with oxygen” • Oxygen is required for these processes to occur: it is the final acceptor of electrons • 34 ATP are produced • Krebs cycle (Citric Acid) & the electron transport chain (ETC)

  9. MitochondrionThe “Powerhouse of the Cell” • Aerobic respiration takes place in the mitochondrion. • This is where most of the ATP is produced.

  10. 1 ATP mitochondrion matrix (area enclosed by inner membrane) 6CO 2 2 energy 2 3 energy from glycolysis ATP inner membrane 6H O 2 6O 2 4 Cellular respiration is like a mirror image of photosynthesis. • The Krebs cycle transfers energy to an electron transport chain. • takes place inmitochondrial matrix • breaks down three-carbonmolecules from glycolysis Pyruvic Acid Krebs Cycle • makes a small amount of ATP • releases carbon dioxide • transfers energy-carrying molecules ETC

  11. 1 ATP mitochondrion matrix (area enclosed by inner membrane) 6CO 2 2 energy 2 3 energy from glycolysis ATP inner membrane 6H O 2 6O 2 4

  12. The Krebs Cycle/Citric Acid Cycle

  13. 1 ATP mitochondrion matrix (area enclosed by inner membrane) 6CO 2 energy 2 3 energy from glycolysis ATP inner membrane and 6H O 6O 2 2 4 ETC • The electron transport chain produces a large amount of ATP. • takes place in inner membrane • energy transferred to electron transport chain • oxygen enters process • ATP produced • water released as awaste product Electron Transport

  14. Electron Transport Chain

  15. Cellular Respiration: Pathways Glucose Glycolysis 2 ATP Without oxygen With oxygen Anaerobic Respiration (fermentation) Aerobic Respiration 34 ATP No additional ATP

  16. Cellular Respiration

  17. Anaerobic Respiration • Lactic Acid Fermentation • Alcoholic Fermentation

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