Anatomy and physiology of gastrointestinal tract pdf

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anatomy and physiology of gastrointestinal tract pdf

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Digestive System Anatomy and Physiology

The gastrointestinal tract GIT consists of a hollow muscular tube starting from the oral cavity, where food enters the 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 enzymes 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. Food is propelled along the length of the GIT by peristaltic movements of the muscular walls. 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. First food must be ingested into the mouth to be mechanically processed and moistened.

The gastrointestinal system is responsible for the breakdown and absorption of various foods and liquids needed to sustain life. The new edition is a highly referenced and useful resource for gastroenterologists, physiologists, internists, professional researchers, and instructors teaching courses for clinical and research students. Clinical gastroenterologists, physiologists, and internists, as well as, professional researchers in gastroenterology, physiology, internal medicine, translational medicine and biomedicine. Chapter He serves as a reviewer on a variety of NIH, VA and other national study sections as well as international European study sections dealing with medical research in internal medicine and nutrition.

Gastrointestinal system anatomy

As adults, we know that a healthy digestive system is essential for good health because it converts food into raw materials that build and fuel our body cells. The organs of the digestive system can be separated into two main groups: those forming the alimentary canal and the accessory digestive organs. The alimentary canal, also called the gastrointestinal tract, is a continuous, hollow muscular tube that winds through the ventral body cavity and is open at both ends. Its organs include the following:. Food enters the digestive tract through the mouth , or oral cavity, a mucous membrane-lined cavity.

Anatomy and physiology of the stomach

The stomach is a muscular, J-shaped organ in the upper part of the abdomen. It is part of the digestive system, which extends from the mouth to the anus. The size of the stomach varies from person to person, and from meal to meal.

Basic Anatomy and Physiology of the Gastrointestinal Tract

Quick Anatomy Lesson: Human Digestive System

The function of the digestive system is digestion and absorption. Digestion is the breakdown of food into small molecules, which are then absorbed into the body. The digestive system is divided into two major parts:. The treatment of food in the digestive system involves the following seven processes:. Propulsion is the movement of food along the digestive tract. The major means of propulsion is peristalsis, a series of alternating contractions and relaxations of smooth muscle that lines the walls of the digestive organs and that forces food to move forward. Secretion of digestive enzymes and other substances liquefies, adjusts the pH of, and chemically breaks down the food.

If your institution subscribes to this resource, and you don't have a MyAccess Profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus. Please consult the latest official manual style if you have any questions regarding the format accuracy. Understand the basic functions of the gastrointestinal system and the design features that subserve these Describe the functional layers of the gastrointestinal tract and the specializations that contribute to function Glands Epithelium Mucosa Muscle Sphincters Identify the segments of the gastrointestinal tract and the specialized functions attributed to each Understand the circulatory features of the intestine and variations that occur after meals Describe the basic anatomy of the neuromuscular systems of the gut. The gastrointestinal system primarily conveys nutrients, electrolytes, and water into the body. In unicellular organisms, metabolic requirements can be met by diffusion or transport of substances from the environment across the cell membrane.

If your institution subscribes to this resource, and you don't have a MyAccess Profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus. Please consult the latest official manual style if you have any questions regarding the format accuracy. The gastrointestinal system consists of the gastrointestinal tract and the accessory exocrine glands. The gastrointestinal tract includes the mouth, the esophagus, the stomach, the small intestine, and the large intestine. The major accessory glands are the salivary glands, the liver, the gallbladder, and the pancreas.


The functions of the gastrointestinal tract and its accessory organs are essential Understanding the anatomy and physiology of the gastrointestinal system is.


Function of the Digestive System

The human digestive system, also known as the digestive tract, the GI tract, the alimentary canal is a series of connected organs leading from the mouth to the anus. The digestive system allows us to break down the food we eat to obtain energy and nourishment. The digestive system -- which can be up to 30 feet in length in adults -- is usually divided into eight parts: the mouth, the esophagus, the stomach, the small intestine or "small bowel" and the large intestine also called "large bowel" or "colon" with the liver, pancreas, and gallbladder adding secretions to help digestion. These organs combine to perform six tasks: ingestion, secretion, propulsion, digestion, absorption, and defecation. The mouth starts the process by ingesting and mechanically breaking down the food we eat into a swallowable form, adding some early secretions to start the process of digestion.

Physiology of the Gastrointestinal Tract, Two Volume Set

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