home *** CD-ROM | disk | FTP | other *** search
- a blind sac, or caecum, tipped by the appendix
- projects off the large intestine. Both the caecum
- and appendix are functionally unimportant in
- humans. The large intestine has three segments:
- the ascending colon, which runs up the right
- side of the abdominal cavity, the transverse
- colon, which runs across the top of the abdominal
- cavity, and the descending colon, which runs
- down the left side of the abdominal cavity. The
- large intestine re absorbs the large quantities of
- water used to secrete enzymes into the upper
- portions of the digestive tract. In addition, the
- large intestine excretes salts, such as calcium and
- iron, when the salts' blood concentrations are too
- high. The large numbers of bacteria that inhabit
- the large intestine feed on the undigested food and
- make up half of the dry weight of feces. The
- rectum is the last segment of the large intestine.
- It stores feces until defecation when the feces are
- eliminated from the rectum through the anus.
-
-