The digestive system prepares food for use by hundreds of millions of body cells. Food when eaten cannot reach cells (because it cannot pass through the intestinal walls to the bloodstream and, if it could, would not be in a useful chemical state. The gut modifies food physically and chemically and disposes of unusable waste. Physical and chemical modification (digestion) depends on exocrine and endocrine secretions and controlled movement of food through the digestive tract.
Go to this site for a more detailed description of the digestive organs and their functions.
A: Overview: Pictorial & Location/ B: Functions: Organ-by-Organ
Overview: Diagrams, Locations & Functions: Organ-by-Organ
The Digestive System
From Wikipedia, the free encyclopedia
* 1 Mouth
* 2 Salivary Glands
* 3 Esophagus (also Oesophagus)
* 4 Stomach
* 5 Liver, Pancreas, and Gallbladder
* 6 Small Intestines
* 7 Large Intestines (Colon)
The mouth is the starting point in the digestive system. Both mechanical and chemical digestion can occur here. The teeth grind food for mechanical digestions while the salivary gland break down for chemically for chemical digestion.
The salivary glands release saliva. The saliva breaks down food chemically. You have three major salivary glands. One on the top of your mouth, one on the bottom and one that covers both sides. Saliva breaks up food using the enzyme salivary amylas
Esophagus (also Oesophagus)
The esophagus, a muscular tube through which partially digested food travels, connects the mouth and the stomach. Food goes down the esophagus using peristalsis, a pattern of muscular movements, contracting and expanding.
The stomach’s job is to break down large food molecules into smaller pieces, so that they are more easily absorbed into the blood.
The stomach can give off two or three liters of gastric juices per day. This juice can even destroy the inner liner of the stomach. This is why the inner lining of the stomach is replaced every two to three days.
Liver & Stomach
Liver, Pancreas, and Gallbladder
The liver puts bile into the small intestine through the biliary system, using the gallbladder as a container to hold the extra bile.
The pancreas puts off a fluid containing bicarbonate and several juices, including trypsin, chymotrypsin, lipase, and pancreatic amylase, as well as nucleolytic juices, into the small intestine. Both these organs help in the process of digestion.
The small intestine connects the stomach and the colon or large intestine. It has three parts. They are the duodenum, jejunum, and the ileum. The walls of the small intestine are lined with villi. Villi help absorb nutrients and put them into the blood. This is the main purpose of the small intestine.
Large Intestine (Colon)
The large intestine is used to remove water from solid waste. It is 1.5 meters in length. It also absorbs some vitamins such as vitamin k.
Human Digestive System
The human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste.
Most of the digestive organs (like the stomach and intestines) are tube-like and contain the food as it makes its way through the body. The digestive system is essentially a long, twisting tube that runs from the mouth to the anus, plus a few other organs (like the liver and pancreas) that produce or store digestive chemicals.
The Digestive Process:
The start of the process – the mouth: The digestive process begins in the mouth. Food is partly broken down by the process of chewing and by the chemical action of salivary enzymes (these enzymes are produces by the salivary glands and break down starches into smaller molecules).
On the way to the stomach: the esophagus – After being chewed and swallowed, the food enters the esophagus. The esophagus is a long tube that runs from the mouth to the stomach. It uses rhythmic, wave-like muscle movements (called peristalsis) to force food from the throat into the stomach. This muscle movement gives us the ability to eat or drink even when we’re upside-down.
In the stomach – The stomach is a large, sack-like organ that churns the food and bathes it in a very strong acid (gastric acid). Food in the stomach that is partly digested and mixed with stomach acids is called chyme.
In the small intestine – After being in the stomach, food enters the duodenum, the first part of the small intestine. It then enters the jejunum and then the ileum (the final part of the small intestine). In the small intestine, bile (produced in the liver and stored in the gall bladder), pancreatic enzymes, and other digestive enzymes produced by the inner wall of the small intestine help in the breakdown of food.
In the large intestine – After passing through the small intestine, food passes into the large intestine. In the large intestine, some of the water and electrolytes (chemicals like sodium) are removed from the food. Many microbes (bacteria like Bacteroides, Lactobacillus acidophilus, Escherichia coli, and Klebsiella) in the large intestine help in the digestion process. The first part of the large intestine is called the cecum (the appendix is connected to the cecum). Food then travels upward in the ascending colon. The food travels across the abdomen in the transverse colon, goes back down the other side of the body in the descending colon, and then through the sigmoid colon.
The end of the process – Solid waste is then stored in the rectum until it is excreted via the anus.
Digestive System Glossary:
anus – the opening at the end of the digestive system from which feces (waste) exits the body.
appendix – a small sac located on the cecum.
ascending colon – the part of the large intestine that run upwards; it is located after the cecum.
bile – a digestive chemical that is produced in the liver, stored in the gall bladder, and secreted into the small intestine.
cecum – the first part of the large intestine; the appendix is connected to the cecum.
chyme – food in the stomach that is partly digested and mixed with stomach acids. Chyme goes on to the small intestine for further digestion.
descending colon – the part of the large intestine that run downwards after the transverse colon and before the sigmoid colon.
duodenum – the first part of the small intestine; it is C-shaped and runs from the stomach to the jejunum.
epiglottis – the flap at the back of the tongue that keeps chewed food from going down the windpipe to the lungs. When you swallow, the epiglottis automatically closes. When you breathe, the epiglottis opens so that air can go in and out of the windpipe.
esophagus – the long tube between the mouth and the stomach. It uses rhythmic muscle movements (called peristalsis) to force food from the throat into the stomach.
gall bladder – a small, sac-like organ located by the duodenum. It stores and releases bile (a digestive chemical which is produced in the liver) into the small intestine.
ileum – the last part of the small intestine before the large intestine begins.
jejunum – the long, coiled mid-section of the small intestine; it is between the duodenum and the ileum.
liver – a large organ located above and in front of the stomach. It filters toxins from the blood, and makes bile (which breaks down fats) and some blood proteins.
mouth – the first part of the digestive system, where food enters the body. Chewing and salivary enzymes in the mouth are the beginning of the digestive process (breaking down the food).
pancreas – an enzyme-producing gland located below the stomach and above the intestines. Enzymes from the pancreas help in the digestion of carbohydrates, fats and proteins in the small intestine.
peristalsis – rhythmic muscle movements that force food in the esophagus from the throat into the stomach. Peristalsis is involuntary – you cannot control it. It is also what allows you to eat and drink while upside-down.
rectum – the lower part of the large intestine, where feces are stored before they are excreted.
salivary glands – glands located in the mouth that produce saliva. Saliva contains enzymes that break down carbohydrates (starch) into smaller molecules.
sigmoid colon – the part of the large intestine between the descending colon and the rectum.
stomach – a sack-like, muscular organ that is attached to the esophagus. Both chemical and mechanical digestion takes place in the stomach. When food enters the stomach, it is churned in a bath of acids and enzymes.
transverse colon – the part of the large intestine that runs horizontally across the abdomen.
The Digestive System
The main purpose of the Digestive system is to break down food and absorb nutrients. There are two basic divisions to the digestive system; these are the gastrointestinal (GI) tract, also known as the alimentary canal, and the accessory digestive organs. Your mouth, pharynx, esophagus, stomach, small intestine and large intestine compose the GI tract, and your teeth, tongue, salivary glands, liver, gall bladder and pancreas are accessory organs.
The digestive system carries out six basic processes:
Ingestion is taking food into the mouth.
Secretion is the act of expelling a liquid. The cells lining the GI tract secrete about 9 liters (9.5 quarts) of water, acid, buffers, and enzymes each day to lubricate the canal and aid in the process of digestion.
Propulsion consists of alternating contraction and relaxation of smooth muscle in the walls of the GI tract to squeeze food downwards.
Digestion has two parts, mechanical and chemical. Mechanical digestion is chewing up the food and your stomach and smooth intestine churning the food, while chemical digestion is the work the enzymes do when breaking large carbohydrate, lipid, protein and nucleic acid molecules down into their subcomponents -these and others are the nutrients-.
Absorption occurs in the digestive system when the nutrients move from the gastrointestinal tract to the blood or lymph.
Defecation is the process of expelling what the body couldn’t use.
For more detailed descriptions of digestive organs with pictures, go to
C: Problems: Organ-by-Organ
Are you clean inside? We tend to ignore cleansing our insides until some form of disease sends us a wake-up call. Our insides, especially the colon, which functions as the body’s “sewer system”, require regular cleaning. The digestive tract problems, listed above, can all be signs of a toxic colon.
We are all exposed to thousands of toxins and chemicals on a daily basis via home, workplace, breathing, food, water, pharmaceutical drugs – in fact, by just living. We eat more sugar and processed foods than ever before in human history. We abuse our bodies with various stimulants and sedatives, antacids, laxatives, diuretics etc. etc.
Death Begins In The Colon
Toxins and “dead” foods lead to poor digestion, constipation, diarrhea, weight gain, low energy and toxic colon build-up. These common symptoms are more than just inconvenient; they can lead to long-term health problems and serious or terminal disease. Autopsies often reveal colons that are plugged up to 80% with waste material. – Vegetarian Times, March, 1998
The waste material in the human body is home to “a sinister world of monstrous creatures that feed on living flesh: parasites”.
The combination of environmental toxins, an unhealthy diet and parasites poses a grave danger to humans. “In fact, parasites have killed more humans than all the wars in history”. – National Geographic
YES: Colon cleansing, physicals, raw fruits and vegetables
NO: antacids, laxatives, diuretics, all OTC (over-the-counter ingestibles)
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