Study guide for exam 1

Study guide for exam 1 - Roles of stomach and small...

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Roles of stomach and small intestine in digestion and absorption: Stomach- breaks up food- gastric juice contains: - acid- HCl pH=2 - Pepsin- lock down protein Small intestine- absorption- functions: - digestion of all the molecules in the contents in digestive tract, including polymers of carbohydrate, protein, nucleic acid, and fat - absorption of the nutrient molecules into the body Stomach (approx. capacity= 1liter) - begins digestion of proteins to peptides (pepsin) - regulates entrance of food into small intestine through Sphincter - contains three layers of muscle (churning and mixing with gastric juices) - Peristalsis (rhythmic contraction) moves food along stomach Small intestine - Duodenum (first part)- secretions sent to it by 2 accessory glands - Liver (largest organ in body) produces bile (stored in gallbladder)- bile salts break up fat into fat droplets (process called emulsification)- mix with H2O- more surface area for digestion by enzymes - Pancreas- pancreatic juice contains sodium bicarbonate (NaHCO3 and
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Study guide for exam 1 - Roles of stomach and small...

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