Digestive system 

Main characteristics
- The digestive system have the responsability of digesting the food that we eat every day.
- The digestion lasts about six or eight hours 

Main parts



Salivary glands
Mouth
Oesophagus
Liver
Stomach
Gall bladder
Pancreas
Large intestine
Appendix
Small intestine
Rectum
Anus











Function
The function of the digestive system is to digest the food and absorb it nutrients with enzyme-rich juices


Digestion
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 liverand its adjuncts—the gallbladder and bileducts. All of these organs and glands contribute to the physical and chemical 
down of ingested food and to the eventual elimination of nondigestible
waste.




Relationships with other systems
- Circulatory system:  it carries by the blood the nutrients to the digestive system
- Respiratory system: the digestive system provides nutrients by the  process of digestion , while respiratory system provides oxygen. Working together they produce energy for the body.
-  Excretory system: the liver receives blood from the intestines and filters  out post digestive waste such as alcohol before the blood is cycled back into the body