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Lab 15 - Digestion
Digestive System
Question | Answer |
---|---|
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 |