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How the Body Works : The Small Intestine


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How the Body Works : The Small Intestine

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The Small Intestine The small intestine, a twenty-one-foot tube, lies in coils in the abdomen. The first ten to twelve inches are called the duodenum, which is the U-shaped section of the small intestine that joins the stomach and the jejunum. The next eight feet, the jejunum and the remaining twelve feet the ileum, join the duodenum with the large intestine. The muscle layers of the small intestine are arranged longitudinally on the outside and circularly on the inside. Between the muscle layers are a series of nerve fibers which control the muscular movements that mix and move food along. The common bile duct is the opening through which bile and pancreatic juices enter the small intestine. As food reaches the duodenum from the stomach, it is mixed with these juices and further digested. At the base of the duct is a ring of smooth muscle, the sphincter, which regulates the outflow of fluid. Digested food is absorbed into the cells through the fingerlike projections lining the small intestine called the villi. The Crypts of Lieberkuhn, numerous tubular glands which open into the intestine from between the villi, secrete an alkaline fluid rich in digestive enzymes and mucus. The mucus protects the tissues of the small intestine from being digested by it's own enzymes. Brunner's glands pour out an alkaline juice to neutralize the acid chyme reaching the small intestine and to create the necessary conditions for further digestion. Tributaries of the portal vein carry digested materials away from the small intestine to the liver. The major function of the small intestine is to complete the digestion of food passing into it from the stomach and to absorb the final products of digestion.

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dizzo95

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Intestine, Small, The,

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The Miracle Of Human Creation part(1) must see
The human body is the most complicated machine in the world. We see with it, hear with it, breathe with it, walk and run with it, and sense pleasure with it. Its bones, muscles, arteries, veins and internal organs are organized with marvellous design, and when we examine this design in detail we find even more amazing facts. Every part of the body, though each may seem to be so different from another, is made up of the same material: cells. Cells, each of which is one thousandth of a millimetre, are the structural units that form our body and everything in it. Some of these cells unite to form bones, others to form nerves, the liver, the inner layer of the stomach, the skin or the cornea of the eyeball. Each has the size and shape that exactly meet the requirement of that part of the body. How and when did cells, which have such varied functions, come into being? The answer to this question will take us into a process whose every moment is filled with mystery. All the approximately 100 trillion cells that make up your body today came from the division of one single cell. That single cell which had the same structure as all the cells in your body now, came from the union of your mother's egg cell and your father's sperm cell. In the Qur'an, God sometimes refers to the wonders of the earth and the sky, and sometimes to the mysteries of the creation of living things as various signs of His existence. One of the most important of these signs is His wondrous creation of human beings. In many verses, as a lesson to human beings, God advises them to turn and look at their own creation. He explains in detail how human beings come to be and what stages they pass through. In Sura 56, He tells of human creation: We created you, so why do you not confirm the truth? Have you thought about the sperm that you ejaculate? Is it you who create it or are We the Creator? (Qur'an, 56: 57-59) The essence of a human being composed of 60-70 kilos of flesh and a mass of bones was originally contained in a drop of fluid. It is certainly a wonder that an intelligent, feeling human being with the faculties of speech and hearing and with a remarkably complex physical structure could come into existence from a drop of fluid. This development was certainly not the result of a random process or the operation of chance, but rather of a conscious process of Creation. This site will explain in detail a wonder that is experienced continually, by every person on the face of the earth the wonder of human creation. It must be made clear that what is dealt with in this site is only a part of the intricacies of human creation; but even what is related in this site reveals once again the eternal power of the Creator, His limitless knowledge and intelligence that surround and embrace the whole universe. And it will remind human beings that Almighty God is "the Best of Creators". We created man from the purest kind of clay; then made him a drop in a secure receptacle; then formed the drop into a clot and formed the clot into a lump and formed the lump into bones and clothed the bones in flesh; and then brought him into being as another creature. Blessed be God, the Best of Creators! (Qur'an, 23: 12-14)
How the Body Works : The Digestive System
The Digestive System Starting at the mouth, the digestive system helps provide the energy your body needs to perform its many functions. Upon entry into a person's mouth, the teeth cut, tear, crush and grind food. In the mouth, salivary glands respond to the thought or presence of food by producing a fluid containing mucus and the enzymes amylase and maltase. The tongue then mixes the food and rolls it into a soft ball, called the bolus, which is pushed toward the esophagus. Passing through the esophagus the bolus is dropped into the stomach where gastric glands, one secreting digestive enzymes and the other secreting hydrochloric acid, begin to break the food down into smaller pieces. The stomach wall discharges mucus during this phase to protect itself against the action of the gastric acid. From there the food passes into the small intestine through the phylorus, a sphincter muscle that controls the flow of food. It is in the small intestine where a major part of digestion and absorption occurs. The intestinal wall releases enzymes which digest proteins, fats and carbohydrates. Blood and lymph vessels, which supply the small intestine, take away the final products of digestion. The lymphatics transport the fats around the body and finally release them into the bloodstream. Blood takes sugars and amino acids to the liver via the portal vein. The pancreas, like the small intestine, secretes enzymes in an alkaline juice to digest proteins, fats and carbohydrates. It also manufactures hormones which regulate the blood sugar level. From the small intestine, the digested food is received by the liver, which manufactures bile for the gall bladder. The gall bladder stores and discharges the bile, which helps to break down fats into minute droplets. Undigested food from the small intestine is then passed into the large intestine. There blood vessels supplying the large intestine carry away water extracted from the undigested waste. After passing through to the large intestine the ileocecal valve prevents digested food from returning to the small intestine. Undigested food is eliminated from the system through the anus.
Inside your Intestine
dont be suprise!!
The Digestive System animation
The Digestive System animation
digestion begins in the mouth
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How the Body Works : The Pancreas
The Pancreas The pancreas is shown here with the foreground highly magnified to reveal its inner anatomy. Ninety-nine percent of pancreatic tissue is composed of acinar glands, which secrete an alkaline digestive juice into the duodenum via the pancreatic duct to help digest food. The endocrine areas of the pancreas, known as the islets of Langerhans, are composed of two major types of cell. The alpha cells secrete the hormone glucagon, and the beta cells secrete insulin, into the bloodstream. These hormones work in opposition to control the blood glucose level. Insulin promotes the uptake and usage of glucose in the tissues, particularly skeletal muscle and fat, and reduces glucose production in the liver. Glucagon has an anti-insulin effect in the liver, increasing glucose release. The anatomy of the pancreas also includes: the ampulla of the common bile duct: the pancreatic duct, which carries digestive juice containing enzymes to the duodenum; the acini, the exocrine portions of the pancreas which secrete digestive juice into the pancreas; the splenic arteries which conduct oxygenated blood into the pancreas; and the mesenteric veins, which carry deoxygenated blood containing insulin and glucagon away from the pancreas.
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