Small intestine Essays

The small intestine plays a key role in digestion and absorption of nutrients. Recent literature reveals that the function of the small intestine is much more complex. The bowel (multicellular organ) is composed of absorptive enterocytes, and other cells viz. secretory, immune and neuroendocrine cells that perform a number of essential physiological functions including secretion of hormones (Petras, 2012). There are three subdivisions in the small intestine viz. duodenum (approx. 25 cm), jejunum

acids. Partially digested food leaves the stomach by the pyloric sphincter area. It then enters the duodenum which is the first segment of the small intestine. The structure of the small intestine is tube like and it extends between the large intestine and the stomach. The small intestine is the longest portion of the intestinal tract. The small intestine in a dog has three parts. The first portion is the duodenum which is attached to the stomach. The middle portion

food into less complex parts, and prepare it for absorbtion in the intestine (Human Digestive System) Because of the fact that our stomach lining is covered by mucus, our stomach is protected from the corrosive nature of acidic substances (Stomach) Part 4 – The

transported to the liver every minute through the hepatic artery and portal vein. Because the fact that the liver produces bile it is considered a gland. The liver is part of the digestive system. This system consists of the stomach, small intestine,large intestine, pancreas, liver, and gallbladder. The first three organs listed are used to move and/or absorb food,

and she is concerned, since her mother and brother have been diagnosed with celiac disease. A blood test ordered by the physician indicated a presence of serum tTg-Iga antibodies commonly found in patients with celiac disease. An autopsy of small intestines was ordered, and the pathologist examining the extracted villai could see damage in them, which confirmed that the patient does have

neck, body, and tail (1). The pancreas consists of two major glands. The majority of the pancreas is composed of exocrine cells that produce enzymes to aid in digestion and absorption of nutrients in the small intestine; these enzymes are secreted through pancreatic ducts into the small intestine. The second component is made out of endocrine cells. These endocrine cells release hormones such as insulin and glucagon directly into the blood stream. The pancreas can be one of the most unforgiving organs

The small intestine consists in four layers: serosa, muscolaris, submucosa and mucosa; this last one consists of three different sublayers: muscolaris mucosa, lamina propria and epithelium. The lamina propria forms the supporting layer of the epithelium and is populated by extracellular matrix producing cells, neurons, smooth muscle fibres and immune cells. The epithelial layer is made up of a single-layered epithelium consist of four cell types: enterocytes, goblet cells, Paneth cells and enteroendocrine

Liver – the human liver has four lobes: right, left, caudate and quadrate. The fetal pig liver has five lobes: right lateral, right central, left central, left lateral, and caudate. Intestines – there is a significant difference in the structure of the fetal pig colon compared to the human colon. The pig colon is spiral. (See p. 45 of the FPDG.) Adrenal glands – In the fetal pig, the adrenal glands are found near the aorta towards the cephalic end of the kidneys, instead of on top of the kidneys

helps the body to break down and digest fats. The liver produces bile which flows into the gallbladder through the bile ducts. After a meal, the gallbladder releases bile when the hormone cholecystokinin is secreted by the small intestine. Then the bile flows into the intestine to break down the fats. There are two common disorders of the gallbladder which are cholelithiasis (gallstones) and inflammation of the gallbladder (cholecytitis). In addition, cancer can affect the gallbladder although it

The separation of the small intestine allows for the duodenum which is the uppermost part where the most digestion occurs in which chyme from the stomach is combined with chemical secretions from the pancreas, liver and gallbladder to facilitate chemical digestion. The jejunum is

actually 6.4 metres long! The job of the small intestine is to absorb nutrients, water and electrolytes. The small intestine consists of three main parts which all play a part in performing these tasks. The Duodenum is the first part. The duodenum is the shortest part of the small intestine. It's job is to receive the half digested food and neutralise it. The next part of the small intestine is the Jejunum. The Jejunum is the middle part of the small intestine and it is here that the digestion process

When the food is passed into the small intestines it is mixed with three liquid. It includes bile which is a bitter greenish-brown alkaline fluid that aids digestion and is secreted by the liver and stored in the gallbladder. Pancreatic juice which is obviously made by the pancreas and intestinal juice. In addition, they’re also enzymes including maltose, sucrase to process the sugar. In the small intestine is where the food breaks down and passes through the walls containing

digestion. Chemical digestion breaks down food via a chemical change, in which the digestive juices and enzymes break down food into components small enough to enter the GI tract, the blood cells or the lymph cells. Mechanical digestion breaks down food via chewing or grinding in the mouth as well as via the muscular activity in the stomach and intestines. Both types of digestion begin in the mouth. The mouth and stomach perform both chemical and mechanical digestion. Nutrition is the process of

Good evening samia,I will explain to you general information about the digestive system and related diseases and the prevention of diseases related to it Digestive system: A long, tortuous canal begins with the mouth and ends with the anus. Which is responsible for digestion of food by converting complex and large food molecules into smaller, absorbable molecules that can penetrate through cellular membranes. This process is performed by mechanical effects caused by muscles and teeth and chemical

the stomach, however resumes in the small intestine.

connects to the stomach, liver and gallbladder that all connects to the intestines, the small and the large. “The esophagus is a muscular tube that connects to the mouth, to the stomach that makes food easier to swallow and move along. The stomach is a j-shaped muscular pouch holds all the food that the body swallows. The gallbladder is an organ that stores bile passing through a tube from the gallbladder to the small intestines. Bile a

and the gallbladder. The GI tract is a long tube that is twisted in shape of hollow organs. The tube starts at the mouth and ends at the anus. The hollow organs of the GI tract involve the mouth, esophagus, stomach which involves the small intestine and large intestine also including the rectum and anus. However, the digestive system involving the hollow organs is not only the system that plays a role in digesting the food. There is also the cardiovascular system that is involved in digestion and absorption

is ingested and passed into the cardiac stomach via the esophagus. In this first stomach food is stored until it is passed into the pyloric stomach; filled with small “teeth” like structures. Once ground the food is handed out to the intestine, where nutrient is absorbed into the blood vessels and taken around the body. After the intestine, the excess waste is removed through the anus. The digestion tract for earthworms is much like the crayfish. Food enters the mouth and gets pushed down into the

by bringing the terminal small bowel through a trephine incision preferably through the rectus muscle and then creating an everted sprout of 2-3 cms in length [2] An ileostomy may be permanent or temporary depending upon their role [3]. There are various reasons for creating an ileostomy like intestinal obstruction, intestinal perforation with fistula formation or abscess, colon or rectal cancers, familial adenomatous polyposis, uncontrolled bleeding from large intestine, ischemic bowel disease,

In this section I will explain how two of the body systems interrelate to perform a function. My two body systems are the cardiovascular system and the digestive system and how they work together to enable food to be digested. First of all, the digestive system works by passing food through the human system, whilst breaking it down and absorbing nutrients. The circulatory system