Question

The primary function of large intestine in human is
A. Storage of waste matter only
B. Extraction of water
C. Digestion of undigested matter
D. Absorption of all digested components

Answer 1

Hint: Large intestine is the last part of the digestive system in humans. It consists of four portions: colon, rectum, anus and cecum. It is greater in diameter than the small intestine.

Complete Answer:
Large intestine is the last part of the gastrointestinal tract. In humans it starts at the end of the small intestine and opens at the anus. In humans it is around 5 feet long. It consist of 4 parts-
1. Colon- it is the largest part of the large intestine.
2. Rectum- It is the last section of the large intestine. It holds the faeces.
3. Cecum- It is the first section of the large intestine involved in digestion.
4. Anus- The faeces are removed out of the body through anus.

Function-
- It absorbs water and the other remaining nutrients from the food.
- It ends the remaining indigestible matter to the rectum.
- It helps in thickening of the faeces.
- It also stores the faeces.
- Fermentation of the indigestible food by the bacteria takes place in the large intestine..

Thus the correct answer is (B). The primary function of the large intestine is extraction of water.

Note: Large intestine is located on the upper side of the abdomen under the spleen. At the lower end of the large intestine, stool is stored in the rectum and is pushed outside through anus during a bowel movement.