Flashcards
Untitled_1
Flashcards do conjunto (14)
- 1Histological 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 - 2What do these abreviations mean? GALT MALTGut/Mouth Associated Lymphatic Tissue
- 3Name 3 salivary glandsParotid
Sublingual
Submandibular - 4Saliva 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 - 5The pharynx is divided into two sections what are these?oropharynx
nasopharynx - 6When 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. - 7where does the chyme from the stomach next enter after stomach digestion?duodenum
- 8What type of digestion occurs in the stomachgastric
- 9What inactive enzyme do the cheif cells in the gastric pit produce and how is it activated?Pepsinogen
Coverted:
Pepsinogen + HCl (low pH) = pepsin - 10what does pepsin digest?large proteins
- 11how 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
- 12what part of the GI tract is the pancreas attached to?Duodenum
- 13what is the pancreas made up offglandular epithelium
- 14What are the 6 stages of digestion?1. ingestion
2. secretion
3. mixing and propulsion
4. digestion
5. absorption
6. defecation
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- FlashCards sobre Untitled_1, criado por alex.kilvington em 01-05-2013.
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