Digestive+System-+Period1+2010


 * Place your team Names at the top. **


 * In logical order complete all of the research points required for your body system.[[file:Body System research3 wiki.doc]] **

First place all the information, pictures and videos you might use on your page here.

Second, build your glog in glogster by summarizing the information, deciding which pictures and videos are most helpful, and then designing an aesthetically engaging glog.

The stomach is protected by the epithelial cells, which produce and secrete a **bicarbonate**-rich solution that coats the mucosa. Bicarbonate is alkaline, a base, and neutralizes the acid secreted by the parietal cells, producing water in the process. This continuous supply of bicarbonate is the main way that your stomach protects itself from autodigestion (the stomach digesting itself) and the overall acidic environment. if stretched out, the system would measure about 30 feet, [] - animation of each step of digestion Viral gastroenteritis is inflammation of the stomach and intestines caused by a virus. The infection can lead to [|diarrhea] and vomiting. It is sometimes called the "stomach flu." Constipation is most often caused by a low-fiber diet, lack of physical activity, not drinking enough water, or delay in going to the bathroom when you have the urge to defecate. Stress and travel can also contribute to constipation or other changes in bowel habits. Other times, diseases of the bowel (such as [|irritable bowel syndrome]), pregnancy, certain medical conditions (like an underactive thyroid or [|cystic fibrosis]), mental health problems, neurological diseases, or medications may be the reason for your constipation. More serious causes, like [|colon cancer], are much less common. Constipation in children often occurs if they hold back bowel movements when they aren't ready for toilet training or are afraid of it.
 * The **mucosa** - the inner layer made up of specialized [|cells], including **parietal cells**, **g-cells** and **epithelial cells**.

Gas can be caused by any of the following: Fun Facts: 5,800 different species and strains of bacteria in the human colon. Most of them are benign or even beneficial. Some of them provide nutrients like vitamin K, and others keep the bad bacteria under control. In your lifetime, your digestive system may handle about 50 tons!! The Liver is the only organ of the body, which has the capacity to regenerate itself completely even after being removed almost completely.
 * Swallowing air while eating.
 * Eating foods that are difficult to digest, such as [|fiber]. If you recently introduced fiber into your diet, having gas may be temporary. Give it a little time. Your body may adjust and stop producing gas.
 * Eating foods that you cannot tolerate -- for example, if you have [|lactose intolerance] and eat dairy products.
 * [|Irritable bowel syndrome] -- a chronic form of stomach upset that gets worse from stress.
 * [|Malabsorption] (when your body cannot absorb or digest a particular nutrient properly, often accompanied by [|diarrhea]).
 * Antibiotics.

media type="custom" key="5395749"

Spleen- holds up to 3 gallons of blood and is a vital organ. It is located on the left side of the body and is just behind the stomach. Stores blood for emergencies ex. when a person cant get enough oxygen.

Liver- recieves the most blood in the body besides the brain. It is the largest gland in the body.

Esophagus- carries food and liquids from the throat to the stomach for digestion after it has been chewed and chemically softened in the mouth

FOOD DIGESTION PROCESS Once the food is chewed and softened in the mouth, the tongue rolls it into a ball or bolus and then pushes the bolus to the throat to be swallowed. During swallowing, a small flap of tissue called the epiglottis prevents food from entering the windpipe. The food then passes into the esophagus. The esophagus is a muscular tube connecting the mouth with the stomach. The esophagus moves the food to the stomach by a serious of muscular contractions called peristalsis. Peristalsis is the wavelike contraction of muscles that move food through the digestive system. As you swallow, the food travels through your esophagus to your stomach. The stomach is a saclike organ of digestion and has walls made of layers of muscle, each arranged on a different angle. As the food enters the stomach, muscle contractions begin to twist, turn, and churn the food. The twisting, turning, and churning of food in the stomach is part of mechanical digestion. The stomach produces gastric juice and mixes it with the food. This gastric juice contains enzymes that begin the digestion of proteins. Proteins are the only substances digested in the stomach. Proteins are only partially digested in the stomach. The food is churned and mixed with stomach fluids until a thick paste called chyme is produced. The chyme passes through the stomach into the small intestine. The small intestine is a long, coiled organ about one inch in diameter. The small intestine may be 7.5 to 9 meters in length. Digestion is completed in the small intestine. The liver releases bile into the small intestine. Bile prepares the fats for digestion. Pancreatic juice contains enzymes that digest carbohydrates and fats. It also contains enzymes that continue the digestion of proteins. The walls of the small intestine release enzymes that complete the digestion of all three basic nutrients. In the walls of the small intestine are millions of small projections called villi. These villi contain many small blood vessels. Digested food is absorbed into these blood vessels and carried to all body cells. The material that has not been absorbed moves into the large intestine, or colon. Here water and salts are absorbed, and the remaining solid waste goes out of the body through the anus.

Stomach-A hollow, sac-like organ connected to the esophagus and the duodenum (the first part of the small intestine), The stomach has several functions: (1) as a storage bin, holding a meal in the upper portion and releasing it a little at a time into the lower portion for processing; (2) as a food mixer, the strong muscles contract and mash the food into a sticky, slushy mass; (3) as a sterilizing system, where the cells in the stomach produce an acid which kills germs in "bad" food; (4) as a digestive tub, the stomach produces digestive fluid which splits and cracks the chemicals in food to be distributed as fuel for the body. Mouth-The function of the mouth and its associated structures is to form a receptacle for food, to begin mechanical digestion through chewing (mastication), to swallow food, and to form words in speech. It can also assist the respiratory system in the passage of air.

esophagus-muscular tube which carries food and liquids from the throat to the stomach for digestion, by powerful waves of muscle contractions passing through the walls of the esophagus,becuase the contractions are so strong we can swallow in any position, has a ring of muscle at the top and at the bottom. These rings close or contract after the food passes through and enters the stomach, If the bottom muscle weakens, stomach contents, along with the stomach acid, may return to the esophagus and cause an uncomfortable, burning sensation known as "heartburn",

small intestine-It is held in place by tissues which are attached to the abdominal wall and measures eighteen to twenty-three feet in the average adult,