The Digestive System 0.0 / 5 ? ScienceKey notes, definitions and processes of the digestive systemA2/A-levelWJEC Created by: ccharris010Created on: 07-02-21 13:41 92783511064 Across 1. Mechanical digestion through action of teeth. Salivary glands release enzymes to start chemical digestion (5) 4. Semi solid material is expelled through the anus (6, 3) 5. Moves bolus of food from mouth to stomach by a series of rhythmic contractions called peristalsis Several cells thick and protects the underlying tissues from damage when swallowing (10) 7. Catalyses the hydrolysis of a peptide bond linking the end amino acid in a peptide chain E.g. carboxypeptidases & aminopeptidases (12) 8. Produces pancreatic juice containing enzymes (8) Down 2. Catalyses the hydrolysis of some interior peptide bonds of a protein molecule E.g. pepsin, trypsin & chymotrypsin (13) 3. Mechanical digestion of food - rugae help (ridges). Gastric glands secrete hydrochloric acid and enzymes (chemical digestion) Muscle layer is thick (3 different layers) to provide power to contract and relax Lots of mucus produced (7) 6. Absorbs water, mineral, salts and vitamins (vitamin K and folic acid secreted by microbes in the gut) Large number of mucous crypts to secrete mucus (5) 9. Produces bile which helps emulsify fats and neutralise stomach acid (5) 10. Part of the small intestine which is responsible for the absorption of digested food Villi (microscopic infolds) - increasing surface area (5)
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