Glycolysis

1
Glycolysis Cellular Respiration
2
Glycolysis

• Breaks glucose in half
• Releases a small amount of energy
• Occurs in the cytoplasm
• Is followed by two types of pathways
• Cellular Respiration
• Fermentation

3
Cellular Respiration

• Process that releases energy by breaking down
  food molecules
• Only occurs when oxygen is present
• Occurs in mitochondria
• Occurs in all eukaryotic organisms
• C6H12O6 6O2 ? 6CO2 6H2O sugar
  oxygen ? carbon dioxide water

4
Cellular Respiration

• 3 main steps
• Glycolysis (in cytoplasm)
• Krebs Cycle (in mitochondria)
• Releases ATP
• Electron Transport Chain (in mitochondria)
• Releases ATP
• The steps help to release the energy in a more
  conservative way.

5
Flowchart
Section 9-2
Cellular Respiration
Glucose(C6H1206) Oxygen(02)
Glycolysis
KrebsCycle
ElectronTransportChain
Carbon Dioxide (CO2) Water (H2O)
Go to Section
6
Respiration An Overview
Section 9-1
Mitochondrion
Electrons carried in NADH
Electrons carried in NADH and FADH2
Pyruvic acid
Glucose
Electron Transport Chain
Krebs Cycle
Glycolysis
Mitochondrion
Cytoplasm
Go to Section
7
Fermentation

• Releases energy from food molecules
• Occurs in the absence of oxygen
• 2 types
• Alcoholic fermentation
• Lactic acid fermentation

8
Alcoholic Fermentation

• Produces carbon dioxide and alcohol
• Examples
• Rising of bread dough
• Alcohol production
• Kimchi
• Yeast and other microorganisms undergo alcoholic
  fermentation

9
Lactic Acid Fermentation

• Produces lactic acid
• Occurs in muscle tissue during exercise when the
  body cannot supply tissues with enough oxygen
• Lactic acid build-up causes a painful, burning
  sensation and muscle soreness

10
Chemical Pathways
Section 9-1
Glucose
Krebs cycle
Electrontransport
Glycolysis
Alcohol or lactic acid
Fermentation (without oxygen)
Go to Section
11
Photosynthesis vs.Cellular Respiration
12
Cellular Respiration vs. Fermentation