The large intestine is the final part of the digestive tract. It's main function is to concentrate and eliminate waste materials (it does not actually digest). Any undigested chyme (chyme consisting of gastric juices and partly digested food, or sandwich) is transferred through the colon where water and salts are absorbed from this chyme while anaerobic intestinal bacteria break it down even further. Some bacteria absorbed certain nutrients and then produce vitamin K. When this process is complete any indigestible material and the colon bacteria form the feces. The feces pass into the rectum, which stores the feces until they are eliminated out of the body through the anus.
- Bicarbonates are released to neutralize acidity
- The lymphoid tissues help in the production of antibodies to create immunities.