1. Anaerobic Respiration Releasing the energy in glucose without oxygen Fermentation and Lactic Acid Formation

2. What is anaerobic respiration? In some situations, oxygen is not available, so cells are forced to perform a second type of respiration which is anaerobic respiration. Anaerobic respiration is not nearly as efficient as aerobic respiration. Not only is anaerobic respiration less efficient, it produces more toxic waste products.

3. Aerobic versus Anaerobic Respiration: Energy Produced. In aerobic respiration one molecule of glucose yields 36 ATP. In anaerobic respiration one molecule of glucose yields only 2 ATP.

4. Aerobic versus Anaerobic Respiration: Wastes Products. Aerobic respiration produces two waste products, CO2 and H2O. These wastes are not particularly toxic. Anaerobic respiration produces either ethyl alcohol or Lactic Acid. These are much more toxic and can damage or kill cells in relatively low concentrations.

5. Anaerobic Respiration: Fermentation Fermentation: The anaerobic conversion of sugar to carbon dioxide and alcohol by yeast The reaction: C 6 H 12 O 6  CH 3 OH + CO 2 + 2 ATP Glucose  Ethyl Alcohol + Carbon Dioxide + 2ATP

6. Fermentation Fermentation is a commerically important chemical reaction. All Alcohol beverages are the result of this process. As the alcohol level increases to about %13 percent, the yeast are killed by the alcohol.

7. Anaerobic Respiration: Lactic Acid Formation In working muscles the level of available oxygen can drop dramatically. This forces your muscle cells to begin anaerobic respiration. The formula Glucose  Lactic Acid + 2 pyruvate + 2ATP. You do not need to know the molecular formula for lactic acid formation.

8. Lactic Acid formation Lactic acid is toxic to your cells The “burn” you feel during strenuous exercise is caused by the build up of lactic acid in your muscle cells. The burning and cramping continue to build until you are forced to stop exercising. These symptoms continue until your circulatory system is able to provide these cells with oxygen and carries the lactic acid away.