1. Cellular Respiration

2. Chemical Energy & Food One gram of glucose = 3811 calories
1 calorie = amount of energy needed to heat 1 gram of water 1 degree Celsius
Food calories are measured in Calories where 1 Calorie = 1000 calories.
What is the difference?

3. Calories

4. Cellular Respiration
Cellular Respiration is the process that releases energy by breaking down food molecules in the presence of oxygen.
6O2 + C6H12O6  6CO2 + 6H2O + Energy
Oxygen + Glucose  Carbon Dioxide + Water + Energy

5. Cellular Respiration

6. Glycolysis
Glycolysis is the process in which one molecule of glucose is broken in half, producing two molecules of pyruvic acid.
2 ATP needed to start reaction, 4 ATP are produced thus the net gain is 2 ATP.

7. Fermentation
Releases energy from glucose without the presence of oxygen.
There are two types of fermentation: alcoholic and lactic acid.
Alcoholic fermentation is done by yeasts and some microorganisms. It produces alcohol & Carbon Dioxide
Lactic Acid is produced by muscles during rapid exercise when the body cannot supply enough oxygen.

8. The Krebs Cycle
During the Krebs Cycle, pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions.
Citric Acid is created in this cycle thus giving it the nickname Citric Acid cycle.
Net ATP Production is 2 ATP.

9. Electron Transport Chain
The electron transport chain uses the high-energy electrons from the Krebs Cycle to convert ADP to ATP.
Total ATP 32.

10. Totals Gycolysis 2 ATP Krebs Cycle 2 ATP
Electron Transport Chain 32 ATP
Total = 36 ATP

11. Comparing Photosynthesis & Respiration
Cellular Respiration
Function
Energy Storage
Energy Release
Location
Chloroplasts
Mitochondria
Reactants
CO2 and H2O
C6H12O6 and O2
Products
Equation
6CO2 + 6H2O  C6H12O6 + 6O2
C6H12O6 + 6O2
6CO2 + 6H2O