34)TransmembTransportSpr11Postred

34)TransmembTransportSpr11Postred - Announcements Exam next...

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1 Announcements Exam next Monday (NOT FRIDAY) Covers through today’s lecture Being scheduled We will use clickers today
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2 Nutrient Assimilation It takes guts Bilaterian Digestion A vertebro-centric view General nature of the challenge Need to: Reduce prey for ingestion Increase SA of food for breakdown Chemical breakdown of material to what can be transported across membranes Transport along gut 41.12 Animals Stages of Nutrient Assimilation Prey Capture/Ingestion Prey Reduction Digestion in all Mechanical reduction in some Absorption - Transport across membranes Elimination Randall, D. et al. 2002. Animal Physiology p. 639 Animals Stages of Nutrient Assimilation Prey Capture/Ingestion Highly ___________!!! Depends on prey type, medium, etc. etc.
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3 Mechanical Breakdown Digestion Intracellular vs. Extracellular “Intra”cellular Hydrolytic enzymes, etc. in extracytoplasmic compartments E.g. “Protists”, sponges, Cnidarians (some) Extracellular Hydrolytic enzymes secreted into lumen Typical for Eumetazoa Digestion - Main Foodstuffs Proteins Acquired as proteins Broken down by ________ (e.g. pepsin) Cross membrane transport as amino acids, usually Transported by Na + /_____ (e.g. lysine) cotransporter Similar to role of H + pump elsewhere. Establish gradient! Fig. 43.16 modified Digestion - Main Foodstuffs Carbohydrates Acquired as mono-, di-, polysaccharides E.g. Glucose, Lactose, “starch,” respectively Broken down by ______________ (e.g. amylase) Cross membrane transport as monosaccharides Transported by Na + /Glucose (e.g.) cotransporter Fig. 43.16
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4 Digestion - Main Foodstuffs Carbohydrates Complications - Some very common polysaccharides (e.g. Chitin, cellulose) are very difficult to break down Many animals harbor cellulase producing microorganisms Only a very few animals are known to produce their own cellulases But the list is growing! What about fats?
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This note was uploaded on 02/01/2012 for the course BSCI 207 taught by Professor Higgins during the Spring '08 term at Maryland.

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34)TransmembTransportSpr11Postred - Announcements Exam next...

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