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Human Digestive System Parts And Functions Pdf

human digestive system parts and functions pdf

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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.

Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream. Digestion is a form of catabolism that is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The term mechanical digestion refers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed by digestive enzymes. In chemical digestion , enzymes break down food into the small molecules the body can use.

The Structure and Function of the Digestive System

The digestive system uses mechanical and chemical activities to break food down into absorbable substances during its journey through the digestive system. The processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation. The first of these processes, ingestion , refers to the entry of food into the alimentary canal through the mouth. There, the food is chewed and mixed with saliva, which contains enzymes that begin breaking down the carbohydrates in the food plus some lipid digestion via lingual lipase. Chewing increases the surface area of the food and allows an appropriately sized bolus to be produced. Figure 1.

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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.

Overview of the Digestive System

Human digestive system , system used in the human body for the process of digestion. The human digestive system consists primarily of the digestive tract , or the series of structures and organs through which food and liquids pass during their processing into forms absorbable into the bloodstream. The system also consists of the structures through which wastes pass in the process of elimination and other organs that contribute juices necessary for the digestive process. The digestive tract begins at the lips and ends at the anus. It consists of the mouth , or oral cavity, with its teeth , for grinding the food, and its tongue , which serves to knead food and mix it with saliva ; the throat, or pharynx ; the esophagus ; the stomach ; the small intestine , consisting of the duodenum , the jejunum, and the ileum ; and the large intestine , consisting of the cecum , a closed-end sac connecting with the ileum, the ascending colon, the transverse colon, the descending colon, and the sigmoid colon , which terminates in the rectum. Glands contributing digestive juices include the salivary glands , the gastric glands in the stomach lining, 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 breaking down of ingested food and to the eventual elimination of nondigestible wastes.


The Human Digestive System- Organs and Functions. Last Updated on The human digestive system consists of the alimentary tract and accessory organs. 1% – tapnetwork2015.org​.


Overview of the Digestive System

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.

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5 Comments

  1. Ninette P.

    07.05.2021 at 09:17
    Reply

    of the digestive tract (mainly in the oral cavity and stomach) physically break Organs of the digestive system are divided into 2 main these teeth follow the human function: the secretion of pancreatic juice by the pancreatic acini and.

  2. Sandor R.

    10.05.2021 at 04:35
    Reply

    There are 6 main functions of the Human Digestive System Process: You can download Human Digestive System Cheat Sheet PDF by clicking on the.

  3. Aiglentina F.

    10.05.2021 at 11:41
    Reply

    Human digestive system, system used in the human body for the process of digestion. The human digestive system consists primarily of the digestive tract, or the.

  4. Jason G.

    12.05.2021 at 07:27
    Reply

    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.

  5. Ignace C.

    13.05.2021 at 02:31
    Reply

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