NST10 - Lect3digestion - Greg Aponte 5166 VLSB Office hours...

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1 Greg Aponte 5166 VLSB Office hours 2:00-3:00 Friday Aponte@berkeley.edu What makes a food ? Carbohydrate Protein Fat Minerals Vitamins Water ? The Gastrointestinal tract is the gateway where food becomes a nutrient The lumen of the gastrointestinal tract (from mouth to rectum) faces the outside of the body ! It not only transforms food in to biologically usable macromolecules but also: Protects against infection Protects against toxins Alters peripheral metabolic responses Alters feeding behavior Accessory organs include: Salivary glands, liver, pancreas, gallbladder
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2 Functions of the intestine aside from nutrient absorption 1 Barrier and immune defense 2 Fluid and electrolyte absorption 3 Synthesis and secretion of several proteins (such as apolipoproteins) 4 Production of bioactive peptides as hormones and neurotransmitters Gallbladder Pancreas Esophagus Stomach Sensory Colon Small intestine Pearson Education Digestive Organs When do we begin the process of digestion?
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3 Cephalic (pregastric) Phase from Nutrition 3rd ed. Bartlet Publishers Sound Appearance Odor Taste/tactile Cognition Regulation of Organ Function starts with a single cell distant communication close communication Paracrine Diagram of the efferent autonomic pathways = Not to panic. No need to memorize this slide (only concepts)
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4 Taste sensations Sweet -often indicates energy rich food Salty -allows for regulating diet electrolyte balance
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NST10 - Lect3digestion - Greg Aponte 5166 VLSB Office hours...

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