Cellular Respiration

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Cellular Respiration

• Ch.7

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(7-1) Cellular Respiration

• Series of complex rxns that converts organic
  cmpds into usable E (ATP adenosine
  triphosphate)
• Used by heterotrophs autotrophs

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Overview

• C6H12O6 6O2 ? 6CO2 6H2O ATP
• Exact opposite of photosynthesis
• 2 stages
• Glycolysis
• Anaerobic no O2 present
• Aerobic Respiration
• Aerobic O2 present

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Glycolysis

• Glucose is broken down into pyruvic acid
  (pyruvate) NADH
• Location cytosol
• Purpose make reactants for the next step a
  little E (net 2 ATP)

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Then What?

• Pyruvic Acid NADH
• No oxygen Oxygen
• Fermentation Aerobic
  Respiration

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Fermentation

• 2 types
• Lactic acid
• Alcoholic
• Purpose make E to keep glycolysis running

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Lactic Acid Fermentation

• Makes lactic acid a little E
• Muscle cells will use this path during strenuous
  workouts cause muscle soreness

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Alcoholic Fermentation

• Makes ethyl alcohol, CO2 a little E
• Fermentation of yeasts is used for the production
  of beers, wines, breads

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(7-2) Aerobic Respiration

• Pyruvic acid NADH is used to make a large amt.
  of ATP
• Occurs after glycolysis when oxygen is present
• Location mitochondrial matrix
• 2 stages
• Krebs Cycle
• e- Transport Chain
• (ETC)

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Krebs Cycle

• Glucose is broken down to make CO2 2 ATPs
• NADH FADH2 made to
• drive next stage

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ETC

• Series of molecules in the inner mitochondial
  membrane that transfers e- from 1 to another
• ATPs produced through chemiosmosis
• Most E in cellular
• resp. is formed
• here (32-34 ATPs)

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Chemiosmosis

• Making of ATP using a chemical conc. gradient of
  H ions across a membrane via the protein ATP
  synthase

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