Biology of Man 475 



Summary of Important Vitamins — Cont'd 



jejunum (eight feet long), and the ileum (twelve feet long). There are 

 two layers of circular and longitudinal muscles for the peristaltic move- 

 ment of foods. The inner walls of the small intestine are covered with 

 large numbers of small, finger-shaped villi located on numerous circular 

 folds. The villi and folds retain the foods for absorption and increase 

 the absorbing area. (5) The large intestine or colon (five feet long) 

 has two layers of circular and longitudinal muscles for the movement of 

 foods and waste materials toward the anal opening. Faulty elimination 

 of waste materials at the proper times from the large intestine results in 

 their being reabsorbed. The large intestine has an enlarged pouchlike 

 cecum, at the junction of the small and large intestines, from which the 

 pencil-shaped vermiform appendix arises. Inflammation of the latter is 



