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Cellular Respiration

Cellular Respiration. Respiration is the process of breaking down food molecules to release energy. What is an aerobic process? Requires oxygen in order to release energy What is an anaerobic or fermentation process? Doesn’t require oxygen to take place

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Cellular Respiration

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  1. Cellular Respiration • Respiration is the process of breaking down food molecules to release energy. • What is an aerobic process? • Requires oxygen in order to release energy • What is an anaerobic or fermentation process? • Doesn’t require oxygen to take place • Glycolysis is the first stage in respiration • 1 molecule of glucose is broken down into 2 molecules of pyruvic acid.

  2. Fermentation Process • Fermentation is carried out by releasing energy without oxygen. • 1. Lactic acid fermentation • Lactic acid forms • Done when your muscles require more energy than you can produce. Muscle soreness. • 2. Alcoholic fermentation • Forms ethyl alcohol and carbon dioxide • The process is done by bacteria, fungi, and yeast. Examples???

  3. Aerobic respiration produces 38 or 36 ATP molecules. • Anaerobic respiration produces only 2 ATP molecules. • Aerobic respiration is much more efficient in producing energy. This is with oxygen.

  4. Basics of Anaerobic Pathways • Pg. 128 (fig. 7-2) – Occurs in the cytosol. • Glucose to 2 molecules of Pyruvic Acid by Glycolysis (4 steps). • 2 ATP used to get 4 ATP when pyruvic acid is formed. This makes a net total of 2 ATP in return. • From here the pyruvic acid can be converted to lactic acid by an enzyme if no oxygen is provided. • Lactic Acid Fermentation • Also, pyruvic acid can be converted to ethyl alcohol if no oxygen is provided. • Alcoholic Fermentation

  5. Basics of Aerobic Pathways • First, Glucose to 2 molecules of Pyruvic Acid by Glycolysis (4 steps). Next is the Krebs Cycle. • Pg. 135  Krebs Cycle (5 steps) – occurs in the mitochondria. • Finally, the Electron Transport Chain, which makes ATP from the NADH & FADH2 of the Krebs Cycle. • Pg. 136 & 137 • 38 ATP are produced, counting the 2 ATP from glycolysis. • Video – cellular respiration

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