Give me descriptions of digestive system.?

Question

I need it for our project. Maybe just a little detail of the digestive system.

Answer 1

http://digestive.niddk.nih.gov/ddiseases...

http://www.enchantedlearning.com/subject...

http://www.answers.com/topic/digestive-s...

Hope these helps... :)

Answer 2

Digestive system begins with mouth[mastication].The salivary amylase in the mouth breaks down raw food as soon as it is put into the mouth.The salivary amylase consists of three components:water,mucusand amylase.Water carries chemicals to dissolve the food,mucus for lubrication,amylase-it is a enzyme.

After mouth it comes to oesophagus.When it comes to end of oesophagus,it enters into stomach through cardiac sphincter.This sphincter prevents back entry of food from stomach into oesophagus.

It is the stomach that contains the gastric secretions needed to further breakdown for the food that has just entered. The gastric juice consists of water, mucus, pepsinogen, and hydrochloric acid (HCl). The water is used to to dissolve, lubricate and carry the food throughout the stomach. Its function is much like that of the water in the salivary amylase. The mucus is also for lubrication but also to line the stomach. Without this mucus lining, the pepsinogen and other acids would eat away the stomach lining. The acids that the mucus protects the stomach are hydrochloric acid and pepsinogen. When the HCl mixes with the pepsinogen, it makes the active form of pepsin. It is pepsin that starts the digestive process in the stomach. Also, the stomach consists of three "compartments" that the food will travel through. The first is the fundus. The fundus is for mixing food and also the digestion of proteins. The body, the next "compartment," is used for the same thing. The last "compartment," the pylorus, is mainly used for emptying the stomach through the pyloric valve. The pyloric valve has almost the same function as the cardiac sphincter. However, instead of keeping food in, it lets food out into the duodenum when it is ready for the stomach to release its contents.As food passes through the pyloric sphincter it enters small intestine[specifically the duodenum].In duodenum 3 enzymes are produced:mucosa. This contains mucus made of bicarbonate. The purpose of the bicarbonate is to neutralize the acids. It also contains secretin and CCK, both are types of hormones. The CCK then signals the pancreas and gallbladder to release other digestive enzymes. It signals for the pancreas to release digestive enzymes such as lipase, trypsin, and many others. These are released as zymogens to be activated later. These enzymes are released to further digest and absorb carbohydrates, fats, and proteins. The gallbladder then releases bile that it has stored.

Bile is produced by liver.It helps in absorption of vitamins such as A,D,E,K.the digested food then proceeds to ileum.In ileum water and vitamins are absorbed.Then to large intestine. it has two parts:appendix and colon.appendix is in betweenlarge and small intestine.It helps in digestion of polysaccharides.In humans it causes appendicitis.Colon is used for absorption of water and certain vitamins such as vitamin K.

Answer 3

these two links will be helpful for you

digestive.niddk.nih.gov/ddiseases/pubs...

www.innerbody.com/image/digeov.html