This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ), lipases , nucleases , and sugarases (amylase and maltase ). The pancreatic juices secreted into the duodenum also include HCO 3-which neutralizes the HCl in the chyme. The pancreas also secretes insulin and glucagon into the blood. The Large Intestine The large intestine reabsorbs water, electrolytes (e.g., Na + , K + , Mg 2+ , Ca 2+ ) and bile. It also absorbs ingested vitamin K . Some normally present bacteria within the large intestine can also produce vitamin K. After reabsorption, the remaining material is known as feces. Approximately 75% of an ordinary sample of human feces is water. Of the remaining 25%, 1/3 is dead bacteria. Another 1/3 of the remaining quarter is indigestible food, such as cellulose . Stretching of the rectum stimulates defecation-- the muscularis layer contracts and the internal anal sphincter relaxes. However, defecation only occurs if the external anal sphincter is voluntarily relaxed....
View Full Document
This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.
- Fall '10