Chapter 37, Problem 13STP

Summary Introduction

To analyze:  The function of the large intestine.

Introduction:

The large intestine is the part of the digestive system. It is larger in diameter than the small intestine. It is divided into three parts: caecum, colon, and rectum. The caecum is a pouch-like structure that also has an outgrowth known as a vermiform appendix. The caecum leads into the colon that is further divided into four regions, ascending transverse, descending, and sigmoid colon. The sigmoid colon opens into the rectum that terminates into the anal canal. 

Explanation of Solution

The chief functions of the large intestine are the absorption of water and the elimination of solid waste. However, moderate quantities of vitamin K and vitamin B complex are manufactured by bacteria present in the large intestine.

No digestions take place in the large intestine. The absorption of water makes the chyme more solid, and it is now called feces. Feces move through the peristaltic movement towards the rectum where it is stored before its elimination. Stretched walls of the rectum cause the anal sphincter to open to pass out the feces.

Conclusion

In the large intestine, no digestion but only absorption of water takes place. The bacteria present in the large intestine helps in the production of vitamin K and vitamin B complex that is also absorbed by the large intestine.