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1.http://www.livescience.com/22367-digestive-system.html
2. http://www.innerbody.com/image/digeov.html

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When you eat something, the food doesn't simply fall through your esophagus and into your stomach. The muscles in your esophagus constrict and relax in a wavelike manner called peristalsis, pushing the food down through the small canal and into the stomach. So if you were upside down the food would still transport to the stomach.

Each year, more than 270,000 Americans develop a cancer of the digestive system, including cancers of the esophagus, stomach, colon and rectum. About half of these cancers result in death. The digestive system is home to more cancers, and causes more cancer mortalities, than any other organ system in the body.

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The cardiovascular system interacts with the digestive system by carrying digested nutrients throughout the body via the bloodstream. The digestive system also works with the excretory system to control the amount of water in the body and release undigested compounds in urine

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The large intestine is a long, thick tube about 2 ½ inches in diameter and about 5 feet long. It is located just lower to the stomach and wraps around the upper and lateral border of the small intestine. The large intestine absorbs water and contains many symbiotic bacteria that aid in the breaking down of wastes to extract some small amounts of nutrients. Feces in the large intestine exit the body through the anal canal.

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The pancreas is a large gland located just inferior and posterior to the stomach. It is about 6 inches long.The pancreas secretes digestive enzymes into the small intestine to complete the chemical digestion of foods.

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The liver is a roughly triangular accessory organ of the digestive system located to the right of the stomach, just inferior to the diaphragm and superior to the small intestine. The liver weighs about 3 pounds and is the second largest organ in the body. The liver has many different functions in the body, but the main function of the liver in digestion is the production of bile and its secretion into the small intestine. The gallbladder is a small, pear-shaped organ located just posterior to the liver. The gallbladder is used to store and recycle excess bile from the small intestine so that it can be reused for the digestion of subsequent meals.

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The small intestine is a long, thin tube about 1 inch in diameter and about 10 feet long that is part of the lower digestive system.The entire small intestine is coiled like a hose and the inside surface is full of many ridges and folds. These folds are used to maximize the digestion of food and absorption of nutrients. By the time food leaves the small intestine, around 90% of all nutrients have been extracted from the food that entered it.

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The stomach is a muscular sac that is located on the left side of the abdominal cavity. This major organ acts as a storage tank for food so that the body has time to digest large meals properly. The stomach also contains hydrochloric acid and digestive enzymes that continue the digestion of food that began in the mouth.

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The esophagus is a muscular tube connecting the pharynx to the stomach that is part of the upper digestive system. t carries swallowed masses of chewed food along its length. At the inferior end of the esophagus is a muscular ring called the lower esophageal sphincter or cardiac sphincter. The function of this sphincter is to close of the end of the esophagus and trap food in the stomach.

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The pharynx, or throat, is a funnel-shaped tube connected to the posterior end of the mouth. The pharynx is responsible for the passing of masses of chewed food from the mouth to the esophagus.Because the pharynx serves two different functions, it contains a flap of tissue known as the epiglottis that acts as a switch to route food to the esophagus and air to the larynx.

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Food begins its journey through the digestive system in the mouth. Inside the mouth are many accessory organs that aid in the digestion of food: the tongue, teeth, and salivary glands. Teeth chop food into small pieces, which are moistened by saliva before the tongue and other muscles push the food into the pharynx.The teeth are 32 small, hard organs found along the anterior and lateral edges of the mouth. Each tooth is made of a bone-like substance called dentin and covered in a layer of enamel: the hardest substance in the body. Teeth are living organs and contain blood vessels and nerves under the dentin in a soft region known as the pulp. The tongue is  a small organ made up of several pairs of muscles covered in a thin, bumpy, skin-like layer. The outside of the tongue contains many rough papillae for gripping food as it is moved by the tongue’s muscles. The taste buds on the surface of the tongue detect taste molecules in food and connect to nerves in the tongue to send taste information to the brain. Surrounding the mouth are 3 sets of salivary glands. The salivary glands are accessory organs that produce a watery secretion known as saliva. Saliva helps to moisten food and begins the digestion of carbohydrates.

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The human digestive system is a series of organs that converts food into essential nutrients that are absorbed into the body and eliminates unused waste material. It is essential to good health because if the digestive system shuts down, the body cannot rid itself of waste.The digestive system begins at the mouth, includes the esophagus, stomach, small intestine, large intestine and rectum, and ends at the anus. The entire system, from mouth to anus, is about 30 feet (9 meters) long.