Which Organ Is A Part Of The Digestive System – Our digestive system is uniquely constructed to perform its function of turning food into the energy you need to survive and packaging the rest for disposal.

The mouth is the beginning of the digestive tract; and, in fact, digestion begins here when you take the first bite of food. Grinding breaks down food into more easily digestible pieces, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.

Which Organ Is A Part Of The Digestive System

Located in your throat near your trachea, the esophagus receives food from your mouth when you swallow. Through a series of muscular contractions called peristalsis, the esophagus delivers food to your stomach.

Overview Of The Digestive System

The stomach is a hollow organ, or “container,” that holds food while it is mixed with enzymes that continue the process of breaking down food into a usable form. Cells in the lining of the stomach secrete a strong acid and powerful enzymes responsible for the decomposition process. When the contents of the stomach are sufficiently processed, they are released into the small intestine.

Composed of three segments – the duodenum, jejunum, and ileum – the small intestine is a 22-foot-long muscular tube that breaks down food using enzymes from the pancreas and bile from the liver. Peristalsis is also at work in this organ, moving food in and mixing it with digestive secretions in the pancreas and liver. The duodenum is largely responsible for the continuous breaking down process, and the jejunum and ileum are primarily responsible for the absorption of nutrients into the blood.

The contents of the small intestine start out semi-solid, and end up in a liquid form after passing through the organ. Water, bile, enzymes, and mucus contribute to changes in consistency. Once the nutrients have been absorbed and the leftover liquid has passed through the small intestine, it goes to the large intestine, or colon.

The pancreas secretes digestive enzymes into the duodenum, the first segment of the small intestine. These enzymes break down proteins, fats, and carbohydrates. The pancreas also makes insulin, secreting it directly into the blood. Insulin is the main hormone for metabolizing sugar.

Digestive System Model

The liver has many functions, but its primary function in the digestive system is to process nutrients absorbed from the small intestine. Bile from the liver secreted into the small intestine also plays an important role in digesting fat. In addition, the liver is the chemical “factory” of the body. It takes raw materials to be absorbed from the intestine and makes all the various chemicals the body needs to function. The liver also detoxifies potentially harmful chemicals. It breaks down and secretes many drugs.

The gallbladder stores and concentrates bile, and then releases it into the duodenum to help absorb and digest fat.

The colon is a 6-foot-long muscular tube that connects the small intestine to the rectum. The large intestine consists of the cecum, the ascending colon (right), the transverse colon (through) the colon, the descending colon (left) and the sigmoid colon, which is connected to the rectum. The appendix is ​​a small tube attached to the cecum. The large intestine is a highly specialized organ responsible for processing waste to empty the bowels easily and conveniently.

Feces, or the waste left over from the digestive process, passes through the colon by means of peristalsis, first in a liquid state and finally in a solid form. As stool passes through the colon, water is removed. Stool is stored in the sigmoid (S-shaped) colon until a “mass movement” empties it into the rectum once or twice a day. It normally takes about 36 hours for stool to pass through the colon. The stool itself is mostly food debris and bacteria. These bacteria perform many useful functions, such as synthesizing various vitamins, processing waste products and food particles, and protecting against harmful bacteria. When the colon becomes full of feces, or stool, it empties its contents into the rectum to begin the elimination process.

Digestive System (parts And Functions: Our…

The rectum (Latin for “straight”) is an 8-inch chamber that connects the colon to the anus. It is the job of the rectum to receive stool from the colon, to let the person know that stool has to be evacuated, and to hold the stool until evacuation occurs. When anything (gas or stool) enters the rectum, the sensors send a message to the brain. The brain then decides whether the rectal contents can be released or not. If they can, the sphincters relax and the rectum contracts, throwing out the contents. If the contents cannot be expelled, the sphincter contracts and the rectum accommodates so that the sensation goes away temporarily.

The anus is the last part of the digestive tract. It is a 2-inch long canal formed by the pelvic floor muscles and two posterior sphincters (internal and external). The upper lining of the anus is specialized for detecting rectal contents. It tells you if these are liquids, gases, or solids. The anus is surrounded by sphincter muscles that are important in allowing stool control. The pelvic floor muscles create an angle between the rectum and the anus that prevents stool from coming out when it’s not supposed to. The internal sphincter is always tight, except when stool enters the rectum. It keeps us continous when we are asleep or otherwise unaware of the presence of stool. When we get the urge to go to the bathroom, we rely on our external sphincter to hold the stool until it reaches a toilet, where it relaxes to release the contents. & Travel Arts & Culture Money Video

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Harvey J. Dworken Professor Emeritus of Medicine, Case Western Reserve University, Cleveland, Ohio. Author of Gastroenterology: Pathophysiology and Clinical Applications and others.

Digestive System Diseases: Common, Rare, Serious Types

William T. Keeton Liberty Hyde Bailey Professor of Biology, Cornell University, Ithaca, New York, 1969–80. Author of Biological Sciences; Elements of Biological Sciences.

Nicholas Carr Hightower Senior Consultant, Department of Gastroenterology, Scott and White Clinic and Scott and White Memorial Hospital, Temple, Texas. Contribute “Digestion” to the best and Taylor, the physiological basis…

Encyclopaedia Editors Encyclopaedia editors oversee subjects in which they have extensive knowledge, whether through years of experience working on that content or through study for an advanced degree. They write new content and verify and edit content received from contributors.

Human digestive system, the system used in the human body for the process of digestion. The human digestive system consists primarily of the digestive tract, or the set of structures and organs through which food and liquid pass through the process in the form of absorption into the blood. The system also consists of the structures in which waste passes through the process of elimination and other organs that contribute juice necessary for the digestive process.

Foodqi New Modelshuman Digestive System Model

The abdominal organs are supported and protected by the bones of the pelvis and ribs and are covered by the greater omentum, a fold of peritoneum consisting mainly of fat.

The digestive tract begins at the mouth and ends at the anus. It consists of the mouth, or the oral cavity, and its teeth, for grinding the food, and its tongue, which is used to knead food and mix it with saliva; the throat, or pharynx; the esophagus; the stomach; the small intestine, consisting of the duodenum, jejunum and ileum; and the large intestine, which includes the cecum, a closed pouch connected to the ileum, the ascending colon, the transverse colon, the descending colon, and the sigmoid colon, which ends in the rectum. Glands that contribute to digestive juices include the salivary glands, gastric glands in the lining of the stomach, the pancreas, and the liver and its adjuncts—the gallbladder and bile ducts. All of these organs and glands contribute to the physical and chemical breakdown of ingested food and to the elimination of indigestible waste. Their structure and function are described step by step in this section.

Little digestion of food actually takes place in the mouth. However, through the process of mastication, or chewing, food is prepared in the mouth for transport in the upper digestive tract to the stomach and small intestine, where the main digestive process takes place. Grinding is the first mechanical process that food undergoes. The movement of the lower jaw in chewing is carried out on the muscles of mastication (the masseter, the temporal, the medial and lateral pterygoids, and the buccinator). The sensitivity of the periodontal membrane that surrounds and supports the teeth, rather than the power of the muscles of mastication, determines the force of the bite.

Chewing is not essential for adequate digestion. Chewing aids digestion, however, by breaking down food into small particles and mixing it with saliva secreted by the salivary glands. The saliva lubricates and moistens dry food, while chewing distributes the saliva

Small Intestine: Anatomy, Function, And Associated Diseases

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