1. 9-2, Part 1 Respiration

2. Overview of Respiration
cellular respiration: the process that releases energy by breaking down molecules in food in the presence of O2
aerobic: processes that require oxygen
6O2 + C6H12O6  6CO2 + 6H2O
oxygen + glucose  carbon dioxide + water
pyruvic acid produced in cytoplasm goes into mitochondria where further energy is released for ATP

3. Electron Transport Chain
Cellular Respiration
Glucose (C6H1206) +
Oxygen (02)
Glycolysis
Krebs Cycle
Electron Transport Chain
Carbon
Dioxide
(CO2) +
Water
(H2O)

4. Electron Transport Chain
Mitochondrion
Electrons carried in NADH
Electrons carried in NADH and FADH2
Pyruvic acid
Glucose
Electron Transport Chain
Krebs Cycle
Glycolysis
Mitochondrion
Cytoplasm

5. The Krebs Cycle Also known as the citric acid cycle
pyruvic acid broken down into carbon dioxide in a series of energy-extracting reactions (2 parts)

6. The Krebs Cycle
Citric Acid Production
Mitochondrion

7. The Krebs Cycle Energy extraction
citric acid is broken down into other compounds releasing 2 molecules of carbon dioxide
each turn of cycle forms 1 ATP from ADP
each turn of cycle releases 5 pairs of electrons captured by 4 NADH and 1 FADH2 (FADH2 is similar to NADH)

8. The Krebs Cycle
Citric Acid Production
Mitochondrion

9. The Krebs Cycle
Citric Acid Production
Mitochondrion

10. Electron Transport Chain
a series of carrier proteins located in the inner membrane of the mitochondrion, takes electrons from NADH and FADH2 from the other reactions
used to convert ADP to ATP
As the electron move they pump H+ across the membrane
as H+ is diffuse back across the membrane from inside an ATP synthetase uses the energy to convert ADP to ATP
each pair of electrons provides enough energy to produce 3 ATP molecules
Requires oxygen

11. Electron Transport Chain
Hydrogen Ion Movement
Channel
Mitochondrion
ATP synthetase
ATP Production

12. The Energy Totals
How much total energy does a single molecule of glucose yield?
glycolysis yields a net 2 ATP
Krebs yields 2 ATP
Electron transport yields 32 ATP
the 36 ATP molecules represents 38% of the energy from glucose
the remaining 62% is released as heat

13. Electron Transport Chain
Mitochondrion
Electrons carried in NADH
Electrons carried in NADH and FADH2
Pyruvic acid
Glucose
Electron Transport Chain
Krebs Cycle
Glycolysis
Mitochondrion
Cytoplasm
2 ATP
2 ATP
32 ATP