digestive system structure and function
Amsel, Sheri. In the mouth are the teeth, tongue and the salivary glands. Day Month Year of access < URL >. disaccharides à monosaccharides, dipeptides à amino acids), Digestion – the preparation of food for absorption, Absorption –nutrients move from the digestive system and into your blood stream, Elimination – non-digestible, non-useful waste must be eliminated from the body, – a muscular tube that passes through the whole body (mouth to anus) and is open at both ends, – the inside surface (or lumen) of this tube is continuous with the outer surface of the body, and so technically, is an extension of the external environment, – structure allows food to enter through one end, products of digestion become absorbed through the lining of the tube, and waste products to be eliminated through the other end, Accessory Organs provide enzymes and other substances that are essential for digestion to occur (salivary glands, pancreas, liver, gall bladder). Organization of The Digestive System Organs of the digestive system are divided into 2 main group : the gastrointestinal tract (GI tract) and accessory structures . The digestive system of each of the eight extant molluscan classes is reviewed, highlighting the most recent data available on histological, ultrastructural and functional aspects of tissues and cells involved in nutrient absorption, intracellular and extracellular digestion, with emphasis on glandular tissues. P2 Describe the structure and function of the digestive system in terms of digestion, absorption and excretion Digestion structure • buccal cavity, The structure of the digestive system, also known as the alimentary canal, allows the different organs to sequentially break down and process food. 3) When you swallow food, it passes through the pharynx (back of the throat) down into the esophagus. It cleans alcohol and drugs from the blood, stores vitamins and reuses the iron in old, worn out red blood cells. The pyloric sphincter is the muscular valve that regulated release of chyme into the small intestine.5) The digested food from the stomach (chyme) empties into the duodenum. By the time it leaves the stomach, the food is broken down into a creamy paste called chyme. Digestive System - Structure and Function The digestive system is where we eat and digest food break it down (digest it), send the usable parts through the blood to the body organs and tissues and get rid of the waste that the body can’t use. Once all nutrients are extracted from the chyme, it is passed into the large intestine.8) The large intestine is about 4.5 feet long (1.5m) and wider than the small intestine. They include the the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The digestive system is made up of the gastrointestinal tract—also called the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The stomach serves as a temporary receptacle for the storage and mechanical distribution of food … This is called peristalsis. The nutrients then pass into the capillaries and are transported around the body to supply all our body systems. The gall bladder stores bile made in the liver.7) The small intestine is about 6 feet long (2 meters) in an adult*, a hollow tube that twists and turns in a jumbled mass tucked inside the curve of the large intestine. The tongue moves the food around to help break it down and mix it with saliva. Saliva is secreted by the salivary glands to begin the chemical breakdown of starchy foods (like bread). The liver performs various functions, but its main job within the digestive system is to process … Liver. Author Last Name, First Name(s). The organs of the digestive system include digestive channel through which food passes (mouth, esophagus, stomach, intestines) and digestive glands (salivary, pancreas, liver, etc. These simple, smaller units can pass through the walls of the small intestine and blood and lymphatic vessels in the process of absorption. The muscles of the esophagus contract to squeeze the food downward. Digestion is the breakdown of food into small molecules, which are then absorbed into the body. The digestive system is a broader term that includes other structures, including the accessory organs of digestion, such as the liver, gallbladder, and pancreas. It churns the food and mixes it with the gastric juices. The large intestine absorbs any left over water, vitamins and electrolytes (like sodium and chloride) in the food waste passing through it. Structure your essay using the sub tittles adjacent. Help Us Fix his Smile with Your Old Essays, It Takes Seconds! The Key Terms. Anatomically, the digestive system is made up of the gastrointestinal tract, along with accessory organs such as the liver, pancreas and gallbladder. The organs of the digestive system work together so that complex biomolecules in food are broken down into their simple monomers and absorbed by the body. Stomach: The stomach is a sac-like structure and happens to be the most dilated part of the digestive system.The primary function of the stomach is to collect and break down food. The accessory digestive organs break down food through action like chewing or with chemicals like saliva. This muscular valve keeps the stomach contents, once mixed with stomach acids, from re-entering the esophagus and burning its unprotected lining.4) The stomach is a storage tank for digesting food. The liver is a large organ, weighing about 3 pounds. The structure of human digestive system is that it is a hollow tube from the mouth to anus called an alimentary canal. The esophagus is a long, muscular tube about 10 inches long (25 cm). It can hold up to a gallon of food. A four-compartment stomach, which includes. It relies on support from other organs like the Liver, Gall Bladder, and Pancreas. The stomach is where protein digestion begins. Article last reviewed: 2020 | St. Rosemary Institution © 2010-2021 | Creative Commons 4.0. what are the main structures of the digestive system to the body cavity? Lipids All rights reserved. Liver. Another chemical in gastric juice is pepsin, the chemical that digests proteins. "Title: Subtitle of Part of Web Page, if appropriate." Activities, Experiments, Online Games, Visual Aids, Life Science and Biology, Resources for Naturalists, Testing, Performance Tasks, Questions, Webquests. Citing for websites is different from citing from books, magazines and periodicals. Food becomes useful only after it has been converted into smaller, simpler and diffusible units. GI tract is a continuous tube extending through the ventral cavity from the mouth to the anus –it consists of the mouth , oral cavity , … They main digestive organs, which make up the GI Tract (gastrointestinal tract), are those through which food passes through the body. The rumen (paunch) The reticulum (“honeycomb”) … The style of citing shown here is from the MLA Style Citations (Modern Language Association). PLAY. The lining of the stomach has lots of goblet cells that make and secrete a slimy mucous to protect the stomach lining from the powerful acids used to digest food. The gall bladder is a tiny, green sac about 4 inches long (10 cm). The digestive system includes Teeth, Mouth, Esophagus, Stomach, Small, Intestine, Large Intestine. Bile helps break down fats. It is here that the pancreas gland sends its pancreatic juice into the food. The structure and function of the digestive system Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Tutor and Freelance Writer. The liver is one of the most important organs of the body. The stomach secretes gastric juice, which digests food like meat, eggs, and milk. When the stomach is empty, it shrinks back down and its walls fold up into wrinkles called rugae. Gastric juice is a mixture of the chemicals that digest food. The digestive system is where we eat and digest food break it down (digest it), send the usable parts through the blood to the body organs and tissues and get rid of the waste that the body can’t use. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus . Because of its location, the pharynx helps the respiratory system by allowing air to make its way to the respiratory tract. There are also gastric pits that make the gastric juice. "Digestive System - Structure and Function" Exploring Nature Educational Resource ©2005-2021. The serosa is a serous membrane that covers the muscularis externa of the digestive tract in the peritoneal cavity. Saliva has a number of functions within the digestive system beyond breaking down starches. It is about 1.5 meters long, beginning at the caecum in the right iliac fossa … F. The Large Intestine. ©2005-2021 Sheri Amsel. – solid food masses are shredded, torn, ground, and shaken, – creates smaller food particles with high surface area, – food broken down by chemical means (ex. Cells in the lining of the stomach secrete a strong acid and powerful enzymes that are responsible for the breakdown process. This lecture covers the main functions of the digestive system and the various structures that the digestive system comprises of. It churns the food and mixes it with the gastric juices.