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34)TransmembTransportSpr11Postred

34)TransmembTransportSpr11Postred - Announcements Exam next...

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1 Announcements Exam next Monday (NOT FRIDAY) Covers through today’s lecture Q&A reviews 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 C&R 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? Challenges?
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