CH369.lecture9.2-25-2009.2

CH369.lecture9.2-25-2009.2 - Overview of Mammalian...

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Unformatted text preview: Overview of Mammalian Metabolism and Free Energy Learning Objectives • Learn how foodstuffs are digested, absorbed stored and mobilized. • Understand relationship between catabolic and anabolic pathways • Understand role of oxidation and reduction in metabolism • Understand free energy relationships in metabolism • Understand the importance of ATP and coupled reactions • Learn various cellular energy transfer compounds Metabolism • Set of all chemical reactions taking place in an organism • Chemoautotroph, obtains all its metabolic building material and free energy from the simple inorganic compounds CO 2 , N 2 , H 2 , and S 2 . • Photoautotrophs, a group includes green plants, need little more than CO 2 , H 2 O, a source of nitrogen and sunlight. • Heterotrophs, a group that includes animals, obtain all their building materials and free energy from organic compounds produced by chemo- or photoautotrophs. • Two subtypes of metabolism within cell – Catabolism – Anabolism Catabolism and anabolism. Starch Proteins Fat (triacylglycerols) Glucose Amino acids Fatty acids Metabolism is the sum of all catabolic and anabolic processes. (Degradative) (synthetic) Digestion of Food in Mammals Role of Pancreas • Secretes many types of digestive enzymes – Proteases – Lipases – Amylases – Ribonucleases Amylase Glucose-Breakage of glycosidic bonds Protease Amino acids-Breakage of amide bonds Digestion of triacylglycerols Lipase Fatty acids-Breakage of ester bonds Energy Storage • Lipids – Neutral fats (triacylglycerides) • Carbohydrates – Much of the carbohydrate that we eat is in the form of starches. These are polymers of glucose....
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CH369.lecture9.2-25-2009.2 - Overview of Mammalian...

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