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Lab 15 - Digestion

Digestive System

Carbohydrases Enzymes that act on complex carbohydrates to convert them simple sugars (monosaccharides).
Salivary Amylase Location - mouth Function - breaks down large polysaccharides into smaller polysaccharides
Pancreatic Amylase Location - duodenum Function - Breaks down carbohydrates into maltose
Maltase Location - intestinal glands Function - breaks down maltose into two glucose molecules Destination - liver
Sucrase Location - intestinal glands Function - breaks down sucrose into glucose and fructose Destination - liver
Lactase Location - intestinal glands Function - breaks down lactose into glucose and galactose Destination - liver
Glycogen Location - liver Function - secondary long-term energy source
Adipose Location - fat all over body Function - primary energy source
Lipase Location - small intestine Function - breaks down fatty acids into glycerol Destination - absorbed into lymph stream via lacteals throughout body
Lacteals Location - small intestine Function - lymphatic vessel that absorbs dietary fats
Protease Location - stomach Function - break down proteins to release amino acids
Pepsin Location - stomach Function - breaks bonds between amino acids resulting in shorter chains
Pancreatic Trypsin, Chymotrypsin, Peptidases Location - small intestine Function - break down amino acid chains Result - smaller chains and individual amino acids
Amino acids Location - all over the body Function - protein synthesis or energy
Hormones of gastrointestinal tract Gastrin, Cholecystokinin, Secretin
Gastrin Secreted by - G cells of stomach, Target - Histamine secreting and parietal cells of stomach, Stimuli - peptides in lumen, Action - increases acid secretion in stomach
Cholecystokinin (CCK) Secreted by - endocrine cells of small intestine, Target - Pancreas, stomach Stimuli - Fat in duodenum Action - gallbladder contraction, inhibits gastric emptying, stimulates section of pancreatic enzymes
Secretin Secreted by - endocrine cells of small intestine Target - Pancreas, stomach Stimuli - acid in duodenum, small intestine Action - stimulates bicarbonate secretion and pepsin release, inhibits gastric acid secretion
Intrinsic Factor Secreted by - oxcyntic or parietal cells in stomach Function - essential in absorption of Vit B12 in small intestine
Chronic Gastritis Results in lack of secretion of Intrinsic Factor causing pernicious anemia
Created by: daydreamer67



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