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100_Chap3b_Cell_Respiration

100_Chap3b_Cell_Respiration - CHAPTER 3 Cellular...

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CHAPTER 3 Cellular Respiration ESSENTIALS OF METABOLISM Photo courtesy of Dr. Brian Oates
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Metabolism Consists of all of the chemical reactions that take place in a cell Organized into metabolic pathways Each contains a series of steps Specific enzymes speed up each step of the pathway
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OXIDATION & REDUCTION REACTIONS Metabolism is broken down into two parts: Catabolism – molecules are broken down through metabolic processes to release the energy stored in their chemical bonds. Anabolism – metabolic processes in which the energy derived from catabolism is used to build large organic molecules from smaller ones.
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CATABOLIC PROCESSES IN METABOLISM Catabolic processes in metabolism cause the breakdown of large organic molecules into smaller ones. These are called fueling reactions because they cause a release of energy .
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Cells Use Cellular Respiration and Fermentation to Generate ATP Cellular respiration and fermentation generate cellular energy They are catabolic pathways Complex molecules are broken down into simpler compounds They release energy
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Cellular Respiration Cellular respiration requires oxygen to break down glucose in a three-step process The final products Carbon dioxide Water Energy
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Summary of Cellular Respiration Blood vessel Carrier Glucose Plasma membrane Electrons transferred by NADH Cytoplasm Electrons transferred by NADH and FADH 2 Electrons transferred by NADH Figure 3.27 protein Oxygen Extracellular fluid Glycolysis glucose pyruvate Mitochondrion Citric Acid Cycle Electron Transport Chain Transition Reaction +32 ATP 36 ATP +2 ATP +2 ATP =
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Cellular Respiration Four phases of cellular respiration: Glycolysis Transition reaction Citric acid cycle (Kreb’s cycle) Electron transport chain They occur continuously in the cell
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