1. What we do with our energy
Cellular Respiration
What we do with our energy

3. Anaerobic vs. aerobic Uses no oxygen Makes a little energy Uses oxygen
Makes a lot of energy

4. Overview Of Cellular Respiration
Cellular respiration is the process that releases energy by breaking down glucose and other molecules in the presence of oxygen.
Mitochondria (mainly)
3 phases
Glycolysis*
Krebs cycle
The electron transport chain

5. Purpose of cellular respiration?
To release energy from food molecules and make ATP!
Why do we need ATP?
To run chemical reactions that keep us alive and functioning.

6. Summary equation for Respiration
Copy equation

7. The pathways

8. Stage 1- The break down of glucose This happens regardless of the amount of oxygen
Glycolysis- Breakdown of glucose in the cytoplasm
Anaerobic
Breaks glucose into 2 pyruvate
2 ATPs required to start the reaction, 4 are produced. (gain of 2 ATPs)

9. Glycolysis uses 2ATP molecules but produces 4ATP molecules so there is a net gain of 2 molecules

10. What if there is no Oxygen?

11. Anaerobic respiration
Not enough oxygen for aerobic respiration
Fermentation-releases energy (ATP) from food molecules when there is no oxygen.
(Anaerobic = no oxygen)
Two types: alcoholic fermentation, lactic acid fermentation

12. Lactic acid vs alcoholic
No oxygen
Occurs in muscles
Pyruvates lactate
Occurs so muscles can continue making ATP
Get lactate build up in muscles
Causes soreness
No oxygen
Pyruvate  carbon dioxide & ethanol
Seen in yeast and fungus
Used to make beverages, food, makes dough rise

14. 9.2 The Krebs cycle and Electron Transport

15. Stage 2: Production of ATP
Krebs cycle
Takes place in mitochondria
The Krebs cycle occurs twice for each glucose molecules
Once for each pyruvate
Remember 2 pyruvate =1 glucose

16. The Krebs Cycle Aerobic (requires oxygen)
Breaks pyruvic acid down into CO2 in a series of energy-extracting reactions
Yields 2 ATPs and high-energy electrons for the electron transport chain

17. The Electron Transport Chain
Uses high-energy electrons from the Krebs Cycle to convert ADP into ATP.
Makes 34 ATP

18. Overall Cellular Respiration breaks down C6H12O6 (glucose).
It produces H2O and CO2
It produces ATPs!
2 ATP - GLYCOLYSIS
2 ATP - KREBS CYCLE
32-34 – E.T.C.

19. Comparing Photosynthesis & Cellular Respiration
Function
Energy capture
Energy Release
Location
Chloroplasts
Mitochondria
Reactants
CO2 & H2O
C6H12O6 & O2
Products
CO2 & H2O
Equation
6CO2 + 6H2O -> C6H12O6 + 6O2
C6H12O6 + 6O2 > > > 6CO2 + 6H2O