64875
Description
Flashcards by alex.kilvington, updated more than 1 year ago
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Created by alex.kilvington
almost 11 years ago
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| Question | Answer |
| Histological structure of the GI tract What are the 4 tissue layers of the GI tract? | 1. mucosa - a thin columnar epithelial layer which forms folds (inside layer) 2. submucosa - increased blood and lymphatic vessels that absorb production of digestion 3. Muscularismucosa - longitudinal and circular smooth (involuntary) muscle 4. serosa layer - simple squamous epithelial and areolar connective tissue |
| What do these abreviations mean? GALT MALT | Gut/Mouth Associated Lymphatic Tissue |
| Name 3 salivary glands | Parotid Sublingual Submandibular |
| Saliva is 0.5% solute. In this solute there is Amalyse lysozymes mucus what do they do? | Amalyse begin digestion of carbohydrates Lysozymes destroy bacteria in food Mucus softens and lubricates |
| The pharynx is divided into two sections what are these? | oropharynx nasopharynx |
| When swallowed the bolus goes through 3 stages moving from the mouth down the oesophagus what are these? | 1. voluntary stage - bolus moves to the back of the mouth 2. pharyngel stage - bolus moves down through the pharynx 3. oesophageal stage - food passes down oesophagus via peristalsis. |
| where does the chyme from the stomach next enter after stomach digestion? | duodenum |
| What type of digestion occurs in the stomach | gastric |
| What inactive enzyme do the cheif cells in the gastric pit produce and how is it activated? | Pepsinogen Coverted: Pepsinogen + HCl (low pH) = pepsin |
| what does pepsin digest? | large proteins |
| how is the surface of the stomach protected from stomach acid? | mucus layer which acts as a buffer of pH 7 which contains bicarbonate ions protecting against autodigestion |
| what part of the GI tract is the pancreas attached to? | Duodenum |
| what is the pancreas made up off | glandular epithelium |
| What are the 6 stages of digestion? | 1. ingestion 2. secretion 3. mixing and propulsion 4. digestion 5. absorption 6. defecation |
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