1. Aerobic vs. Anaerobic Respiration

2. Aerobic Energy Conversion
Energy production that uses oxygen
Ex. Cellular respiration
Makes 38 ATP per glucose!!!
Stage 2: Oxygen needed
Stage 1: Oxygen not needed
Stage 3: Oxygen needed
Therefore…Overall Cellular respiration is an aerobic process

3. Why is O2 needed?
Hydrogen atoms produced by reactions in the Krebs cycle and Electron Transport system are combined with oxygen to make water.
With out oxygen these stages cannot occur
2 H+ + 1/2O2 --> H2O

4. Where does the oxygen come from?
O2 from the air is collected in the lungs and transferred to the blood.
The circulatory system delivers this blood to every cell in your body.
Blood also carries away byproducts of cellular respiration
Ex. CO2

5. What happens when the oxygen is used up?
Oxygen supplies can be used up quickly through…
Bursts of intense energy usage.
Ex. Sprinting
Extended exercise with little rest
How did Protocol 1 from Lab 5-2 show this?
Limited blood flow
How did Protocol 4 from Lab 5-2 show this?
Do muscles stop working when the oxygen is used up?

6. Anaerobic Energy Conversion
Energy production that does not require oxygen.
Lactic Acid Fermentation
Enzyme-catalyzed reactions
Includes glycolysis
Occurs in cytoplasm of cells
Produces ONLY 2 ATP!
Produces Lactic Acid

7. Muscle Fatigue
Build up of lactic acid in muscles results in the feeling of fatigue.
Blood flow removes lactic acid from muscle cells (goes to the liver).
Efficient circulatory systems remove lactic acid faster
This is one reason for conditioning before competitions. (Getting “warmed up”)

8. Ethanol Fermentation Anaerobic energy conversion in Yeast
Enzyme-catalyzed reactions
Includes glycolysis
Occurs in cytoplasm of cells
Produces 2 ATP
Produces Ethanol and CO2