E3 lecture6 - nutrition and digestion

E3 lecture6 - nutrition and digestion - Nutrition and...

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Nutrition and Digestion Polymer build-up; polymer breakdown (“hydrolysis…”) A few important enzymes: - amylase/lactase (carbohydrates) - pepsin/trypsin (proteins) - lipase (fats) Human Digestive System 1) Mouth - digestion starts here - mechanical digestion - chemical digestion: saliva has “amylase” (starch breakdown) 2) Pharynx/esophagus - peristalsis: muscular contractions that move food from mouth to stomach 3) Stomach - gastric juices are acidic - “chyme” - mixture of gastric juice and food - protein digestion begins (“pepsin” enzymes) …Pyloric sphincter – circular muscle at end of stomach 4) Small intestine (3 meters [10 feet] long) - longer, but narrower than large intestine - is the main organ for chemical digestion and absorption - all polymers broken down to monomers i) duodenum - first 25 cm of small intestine - receives chyme; adds “hydrolase” enzymes (“pancreatic juices”) - bile salts - help breakdown of lipids (produced in liver; stored in gallbladder) ii) jejunum and ileum:
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E3 lecture6 - nutrition and digestion - Nutrition and...

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