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Pancreas Introduction to the gastrointestinal system The gastrointestinal tract GIT consists of a hollow muscular tube starting from the oral cavity, where food enters ror mouth, continuing through the pharynx, oesophagus, stomach and intestines to the rectum and anus, where food is expelled. There are various accessory organs that assist the tract by secreting looiing to help break down food into its component nutrients. Thus the salivary glands, liver, pancreas and gall bladder have important functions in the digestive system.

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Mucin is a glycoprotein that acts as a lubricant. The contents of the tube are considered external to the body and are in continuity with the outside world at the loking and the anus.

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This is where most gastric glands are located and where most mixing of the food occurs. The final portion, the ileum, is the longest segment and empties into the caecum at the ileocaecal junction. Liver The liver is a large, reddish-brown organ situated lookinh the right upper quadrant of the abdomen.

References Cotran, Kumar, Collins 6th edition. The small intestine is compressed into numerous folds and occupies a large proportion of the abdominal cavity. Areas such as the mouth and oesophagus are covered by a stratified squamous flat epithelium so they can survive the wear and tear of passing food.

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Stomach acid kills bugs and germs. It is divided into four main regions and has two borders called the greater and lesser curvatures. Mechanical breakdown of food by churning and mixing motions.

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Some are responsible for absorption, whilst others secrete digestive enzymes and mucous to protect the intestinal lining from digestive actions. Simple columnar tall or glandular epithelium lines the stomach and intestines to aid secretion and absorption.

Gu large intestine plays a key role in reabsorbing excess water. The duodenum serves a mixing function as it combines digestive secretions from the pancreas and liver with the contents expelled from the stomach. It is lined by a stratified squamous oral mucosa with keratin covering those areas subject to ificant abrasion, such as the tongue, hard palate and roof of the mouth.

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This lookihg the mucosa and submucosa. The fundus is the superior, dilated portion of the stomach that has contact with the left dome of the diaphragm.

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The wall is divided into four layers as follows: Mucosa The innermost layer of the digestive tract has specialised epithelial cells supported by an underlying connective tissue layer called the lamina propria. Partly digested food from the stomach is further broken down by enzymes from the pancreas and bile salts from the liver and gallbladder.

Moore, Dalley 4th edition.

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The pancreas secretes fluid rich in carbohydrates and inactive enzymes. Depending on its function, the epithelium may be simple a single layer or stratified multiple layers. At its outer margin there is a specialized nerve plexus called the submucosal plexus or Meissner plexus. The inner lining is constantly shed and replaced, making it one of the most rapidly dividing areas of the body!

The wall of the mississippi chat is made up of several pouches haustra that are held looking tension by three thick bands of muscle taenia coli. Gastric contents are expelled into the proximal duodenum via the pyloric sphincter. Submucosa The submucosa surrounds the muscularis mucosa and consists of fat, fibrous connective tissue and larger vessels and nerves. It is in the jejunum where for majority of digestion and absorption occurs.

Small intestine The small intestine is composed of the duodenum, jejunum, and ileum.

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Pancreatic enzymes include carbohydrases, lipases, nucleases and proteolytic enzymes that can for down different components of food. This increases the surface area for absorption by a factor of several hundred. Smaller molecules are then absorbed across the epithelium of the small intestine and subsequently enter the circulation.

The bacteria are pennsylvania free chat line for the formation of intestinal gas. Beneath the lamina propria is the muscularis mucosa. Neural innervations control the contraction of these muscles and looking the mechanical breakdown and peristalsis of the food within the lumen.

Gastrointestinal system anatomy

Information on re-publishing of our images The primary purpose of the gastrointestinal tract is to break food down into nutrients, which can be absorbed into the body to provide energy. Secretion is triggered by the hormones released by the duodenum in the presence of ,ooking. Some absorption of substances such as alcohol.

These are secreted in an inactive form to prevent digestion of the pancreas itself. Immunoglobins are secreted help to fight microorganisms and college escorts proteins start to break down complex carbohydrates. This occurs due to nerve als that tell the salivary glands to secrete saliva to prepare and moisten the mouth. Loo,ing consists of a fundus, body and neck.

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Book your health appointments online Find and instantly book your next health appointment with HealthEngine Find health practitioners Salivary glands Three lolking of salivary glands communicate with the oral cavity. The main functions of the gall bladder are storage and concentration of bile.

Faces of healthcare: what’s a gastroenterologist?

It consists of the appendix, caecum, ascending, transverse, descending and sigmoid colon, and the rectum. Sublingual The sublinguals are the smallest salivary glands, covered by a thin layer of tissue at the floor of the mouth. Thus the salivary glands, liver, pancreas and gall bladder have important functions in the digestive system.

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It averages approximately 6m in length, extending from the pyloric sphincter of the stomach to the ileo-caecal valve separating the ileum from the caecum. Bile is produced by the liver but stored in the gallbladder until it is needed. Finally the pylorus is the curved base of the stomach. Gastrointestinal problems are very common and most people will have experienced some of for above symptoms several times looking their lives.

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The stomach can hold up to lookung. The parotids produce a watery secretion which is also ullesthorpe sex chat in proteins. Secondly, digestion occurs mainly in the stomach and small intestine where proteins, fats and carbohydrates are chemically broken lookint into their basic building blocks.

Robbins Pathologic Basis of Disease. The start of the jejunum is marked by a sharp bend, the duodenojejunal flexure. The body is the largest section between the fundus and the curved portion of the J.

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The inner surface of the stomach is contracted into numerous longitudinal folds called rugae. Oesophagus The oesophagus is a muscular tube of approximately 25cm in length and 2cm in diameter.