1. Cell Respiration

2. How do we get energy from food?
Cell Respiration – mitochondria break down food to make ATP (energy)
Formula:
C6H12O6 + 6O > 6CO2 + 6H20 + energy (heat and ATP)
1 glucose + 6 oxygen  6 carbon dioxide + 6 water + energy

3. 3 Stages of Cell Respiration

4. 2. 3. 1.

5. 3 Stages of Cell Respiration:
Glycolysis
Anaerobic – no oxygen required
Occurs in the cytoplasm
Glucose  2 pyruvic acids*
Net ATP production = 2

6. 3 Stages of Cell Respiration:
2. Citric Acid Cycle (a.k.a. Krebs Cycle)
Occurs in mitochondria, requires oxygen (aerobic)
Net ATP production = 2

7. 3 Stages of Cell Respiration:
3. Electron Transport Chain
Occurs in mitochondria, requires oxygen (aerobic)
Net ATP = 32

8. Electron Transport Chain Animation

9. * If oxygen is not available, cell undergoes fermentation after glycolysis.

10. 2 Types of Fermentation

11. 2 Types of Fermentation:
1. Lactic Acid – lactic acid builds up in muscles when they do no get enough oxygen  muscle fatigue

12. Other Products?

13. 2 Types of Fermentation:
2. Alcoholic – yeast cells produce CO2 and ethyl alcohol (a.k.a. ethanol).

14. Other Products?

15. ANAEROBIC CONDITIONS:
Aerobic vs. Anaerobic
AEROBIC CONDITIONS:
(oxygen present)
Cell Respiration
36 ATP
ANAEROBIC CONDITIONS:
(no oxygen)
Fermentation
2 ATP
Which is more efficient (which produces MORE energy)?