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B-3.2: Summarize the basic aerobic and anaerobic processes of cellular respiration and interpret the chemical equation for cellular respiration. Cellular Respiration without oxygen. Quick Review of aerobic respiration. If there is oxygen present, it is aerobic respiration
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B-3.2: Summarize the basic aerobic and anaerobic processes of cellular respiration and interpret the chemical equation for cellular respiration. Cellular Respiration without oxygen
Quick Review of aerobic respiration • If there is oxygen present, it is aerobic respiration • After glycolysis occurs in the cytoplasm, the pyruvates made move into the mitochondria and travel to the Krebs cycle and then onto the electron transport chain • What is made? ENERGY!!! • 34 to 36 ATP molecules
Think about a time when you worked out very hard… • How did you feel?
No oxygen available, what happens? • If no oxygen is available, then the body must use anaerobic respiration to obtain energy. • Fermentation
Fermentation • Not very efficient • Very few ATP molecules compared to aerobic respiration • Take place in the cytoplasm of the cell • 2 primary fermentation processes: • Lactic acid fermentation • Alcohol fermentation
Lactic Acid Fermentation • No oxygen available • Occurs in muscle tissues during vigorous exercise • When muscle cells may be depleted of oxygen
Lactic Acid Fermentation • Pyruvic acid from glycolysis is broken down into lactic acid • When it is broken down, it releases energy • Glucose pyruvic acid lactic acid + energy • Replaces aerobic respiration so the cell can continue to have energy even when oxygen is not present • Only temporary • Cell still need oxygen for sustained activity • Lactic acid build up in tissues causes burning, painful sensation
Alcohol fermentation • Occurs in yeast and some bacteria • Pyruvic acid from glycolysis is broken down to produce alcohol and carbon dioxide • Releases energy in the process • Glucose pyruvate alcohol + CO2+ ATP