File Name: digestive system structure and function .zip
The digestive system includes the digestive tract and its accessory organs, which process food into molecules that can be absorbed and utilized by the cells of the body. Food is broken down, bit by bit, until the molecules are small enough to be absorbed and the waste products are eliminated. The digestive tract, also called the alimentary canal or gastrointestinal GI tract , consists of a long continuous tube that extends from the mouth to the anus.
- Digestive System
- The Structure and Function of the Digestive System
- Introduction to the Digestive System
Your digestive system is uniquely constructed to do its job of turning your food into the nutrients and energy you need to survive. The main organs that make up the digestive system in order of their function are the mouth, esophagus, stomach, small intestine, large intestine, rectum and anus. Helping them along the way are the pancreas, gall bladder and liver. The mouth is the beginning of the digestive tract. In fact, digestion starts before you even take a bite.
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.
Victorian government portal for older people, with information about government and community services and programs. Type a minimum of three characters then press UP or DOWN on the keyboard to navigate the autocompleted search results. The following content is displayed as Tabs. Once you have activated a link navigate to the end of the list to view its associated content. The activated link is defined as Active Tab. Barium tests are used to examine conditions of the digestive tract such as reflux, narrowing or ulceration The digestive tract can be thought of as a long muscular tube with digestive organs attached along the way
The Structure and Function of the Digestive System
The function of the digestive system is to break down the foods you eat, release their nutrients, and absorb those nutrients into the body. Although the small intestine is the workhorse of the system, where the majority of digestion occurs, and where most of the released nutrients are absorbed into the blood or lymph, each of the digestive system organs makes a vital contribution to this process [link]. As is the case with all body systems, the digestive system does not work in isolation; it functions cooperatively with the other systems of the body. Consider for example, the interrelationship between the digestive and cardiovascular systems. Arteries supply the digestive organs with oxygen and processed nutrients, and veins drain the digestive tract.
Introduction to the Digestive System
This article — the second in a six-part series on the gastrointestinal tract — describes the role of the stomach in chemical and mechanical digestion, regulation of hunger, eradication of pathogens and nutrient absorption. It also discusses common stomach pathologies. After travelling through the mouth, pharynx and oesophagus, ingested food and liquids enter the stomach through the lower oesophageal sphincter. The stomach is both a reservoir for ingested food and a mixing and digestion chamber. It continues the process of mechanical and chemical digestion with the help of a range of gastric enzymes and its various layers of smooth muscle, before funnelling food turned into chyme into the duodenum.
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion the tongue , salivary glands , pancreas , liver , and gallbladder. Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The process of digestion has three stages: the cephalic phase , the gastric phase , and the intestinal phase. The first stage, the cephalic phase of digestion, begins with gastric secretions in response to the sight and smell of food. This stage includes the mechanical breakdown of food by chewing , and the chemical breakdown by digestive enzymes, that takes place in the mouth.
The gastrointestinal tract , GI tract , GIT , digestive tract , digestion tract , alimentary canal is the tract from the mouth to the anus which includes all the organs of the digestive system in humans and other animals. Food taken in through the mouth is digested to extract nutrients and absorb energy, and the waste expelled as feces. The mouth , esophagus , stomach and intestines are all part of the gastrointestinal tract. Gastrointestinal is an adjective meaning of or pertaining to the stomach and intestines.
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Ecophysiology of Spiders pp Cite as. Spiders are extraordinary in their mode of digestion which is known as extra-oral. Digestive fluid is poured over and into the prey and the dissolved material is swallowed into the intestine where it is subjected to further and final digestion. Together with this peculiar method of food consumption, we find a number of anatomical adaptations and physiological adjustments, the functional relationship of which has been studied since the early works of Bertkau Unable to display preview.
The digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. Food passes through a long tube inside the body known as the alimentary canal or the gastrointestinal tract GI tract. The alimentary canal is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. In addition to the alimentary canal, there are several important accessory organs that help your body to digest food but do not have food pass through them. Accessory organs of the digestive system include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.
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