Ch 9 Cellular Respiration

1
Ch 9 Cellular Respiration

• Explain cellular respiration and its three
  stages glycolysis, Krebs cycle and electron
  transport chain.
• Know where each stage of cellular respiration
  takes place.
• Write the chemical equation for cellular
  respiration and identify the reactants and
  products.
• Distinguish between aerobic and anaerobic
  respiration.
• Describe the two main types of fermentation?

2
Cellular Respiration

• process that releases energy by breaking down
  food molecules
• Aerobic respiration
• requires oxygen
• takes place in the mitochondria
• converts sugar and oxygen into carbon dioxide,
  water, and energy ATP
• three sets of chemical reactions
• glycolysis
• Krebs cycle
• electron transport chain

3
Chemical Equation

• C6H12O6 O2 ? CO2 H2O ATP
• glucose oxygen yields carbon dioxide water
  energy

4
Glycolysis

• process in which one molecule of glucose is
  broken in half, producing two molecules of
  pyruvic acid
• takes place in cytosol of cytoplasm
• does not require oxygen
• converts glucose, ADP, and NAD
• to pyruvic acid, ATP, and NADH
• net production of ATP 2 ATP

Glycolysis.mov
5
Krebs Cycle

• second stage of cellular respiration, in which
  pyruvic acid is broken down into carbon dioxide
  in a series of energy-extracting reactions
• takes place in matrix of mitochondrion
• converts pyruvic acid, NAD, FAD, and ADP
• to CO2, NADH, FADH2, ATP
• net production of ATP 2 ATP

6
Electron Transport Chain

• high-energy electrons from the Krebs cycle are
  used to convert ADP into ATP
• takes place at inner membrane of the
  mitochondrion
• converts O2, NADH, FADH2 and ADP
• to H2O, NAD, FAD, ATP
• net production of ATP 32 ATP

7
Electron Transport Chain
8
Cellular Respiration

• Glycolysis
• 2 ATP
• Krebs Cycle
• 2 ATP
• Electron Transport Chain
• 32 ATP

Total 36 ATP
9
Anaerobic Respiration

• process by which cells release energy in the
  absence of oxygen
• also known as fermentation
• begins with Glycolysis
• Two types of fermentation
• lactic acid fermentation
• animal muscles
• pyruvic acid NADH ? lactic acid NAD
• alcoholic fermentation
• Yeasts and a few other microorganisms
• forms ethyl alcohol and carbon dioxide as wastes.
  
• pyruvic acid NADH ? alcohol CO2 NAD

10
Aerobic Respiration Anaerobic Respiration
Cellular respiration Fermentation
requires O2 no O2 required
36 ATP 2 ATP
Glycolysis Krebs Cycle Electron Transport Chain Glycolysis Lactic acid fermentation or Alcoholic fermentation