Cell Respiration Chemosynthesis Autotrophs get E from inorganic compounds instead of light Chemosynthesis Cell Respiration Food is broken down to release E Essential to Life Not breathing! Cell Respiration C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + E Mitochondria Where cell respn takes place Powerhouse of cell Aerobic Respiratn Requires O (O= Oxygen) Anaerobic Respiratn Doesnt require O Hardcore exercise Cell Respiration THREE PHASES: 1.Glycolysis 2.Krebs Cycle 3.Electron Transport Chain (ETC) Glycolysis Splits Glucose Occurs in cytoplasm With or without O Yields: 2 ATP After Glycolysis If no O is present fermentation begins If O is present Krebs Cycle begins Krebs Cycle Hans Kreb, British biochemist in 1937 Pyruvic Acid broken down into CO 2 Krebs Cycle Occurs in mitochondria Yields 2 ATP CO 2 is exhaled ETC High E electrons convert ADP to ATP Matrix of mitochondria Yields 32 ATP *Most ATP After Glycolysis If no O is present fermentation begins If O is present Krebs Cycle begins Fermentation No O 2 present Two types: Lactic Acid Fermtn lactic acid is product Ex. Muscles & muscle fatigue Alcoholic Fermtn Makes Ethyl alcohol & CO 2 Alcohol in beverages CO2 in breads Totals Review Glycolysis yields 2 ATP Krebs yields 2 ATP, ETC yields 32. For a total of 36. Final wastes are water & carbon dioxide. Body uses 38% of the energy. 62% is released as heat. Cell Respiration Glucose (C 6 H ) + Oxygen (0 2 ) Glycolysis Krebs Cycle Electron Transport Chain Carbon Dioxide (CO 2 ) + Water (H 2 O)