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FUNCTION OF THE ALIMENTARY TRACT - Coggle Diagram
FUNCTION OF THE ALIMENTARY TRACT
PURPOSE OF MOUTH
MASTIFICATION., LUBRICATION, DISCRIMINATION
PURPOSE OF LIVER
DETOXIFICATION AND PROTEIN SYNTHESIS
PURPOSE OF STOMACH
RESEVOIR(food stored here during first hour of digestion) fundus and body of stomach. relaxes allowing large volume 1.5L of food storage AND DECONTAMINATOR vagal reflex inhibit smooth muscle tone mechanoreceptors fundic relaxation (VIP AND NO CAUSE RELAXATION)
stomach has oblique layer of smooth muscle tissue which helps in the complex grinding motions
antral region mixes food with gastric acid secretions-DIGESTION
colon region stores digestive residues- faeces
PURPOSE OF PANCREAS
ACID NEUTRALISATION CNONTAIN HCO3-
storage of gastric secretions
stomach stores 2-3 litres of gastric juice(mucus. pepsinogen, intrinsic factor, lipase) which help in digestion
mucus-secreted by goblet cells act as a lubricant by acting as a barrier which protects colon and stomach.
lipase- converts triglyceride into glycerol and fatty acid
pepsin- protein digestion(chief cells)
intrinsic factors(parietal cells) for vitamin B12 absorption
somatostatin- inhibit gastrin release in stomach
EXOCRINE SECRETIONS-secretions from glands with ducts
SALIVARY GLANDS-MUCUS(LUBRICATION, MASTIFCATION AND SPEECH)
HCL, MUCUS, PEPSIN
LIVER-BILE ACIDS
HCO3- IONS, ENZYME
ENDOCRINE SECRETIONS-HORMONES
GASTRIN- STOMACH( G cells in antrum)
secretin- duodenal mucosa promotes watery secretion of HCO3- from the pancreas
Insulin- pancreas B cells
absorption occurs mainly In the small intestine/ fluid absorption occurs in the intestine and colon
MOTILITY
MOVEMENTS OF MUSCULAR WALL:
1- law of gut, moving food from one region to another
2- storage
3- mechanical degradation e.g gastric antrum
4- mixing lumen contents e.g small intestine
5- transport of urea and electrolytes
excretion- food leaves body through bile, faeces, vomit,saliva
DEFENCE- THE GUT EPITHELIUM IS AN INTERFACE WITH THE OUTSIDE WORLD, THE INTESTINE IS THE LARGEST MUCOSAL SURFACE IN THE BODY- ALSO LARGEST LIMPHOEPITHELIAL ORGAN
LIVER-major metabolic organ as well as bile production and bilirubin excretion
DEFENCE MECHANISMS
SIGHT SMELL AND TASTE ALERT US TO HARMFUL FOOD
VOMIT REFLEX
ACID IN STOMACH
NATURAL BACTERIAL FLORA
aggregation of lymphoid tissues
