School Biology Project:Digestion VI

by davincico
Last updated 11 years ago

Life Science

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School Biology Project:Digestion VI

1st stop:The CaecumThe caecum is the first part of the large intestine. Shaped like a small pouch and located in the right lower abdomen, it is the connection between the small intestine and the colon.What does the caecum do?The caecum accepts and stores processed material from the small intestine and moves it towards the colon. At this stage, the mixture contains:-undigested food (fibre)-a little bit of water-some vitamins-some minerals or salts

The large intestine (or large bowel) is the part of the digestive system where waste products from the food you eat are collected and processed into faeces.It performs the following functions:-Reabsorbs water-Absorbs certain vitamins-proccesses undigested food(fibre)-stores waste before being eliminated

Digestion:The Large Intestine

2.The AppendixThe appendix is a small projection emerging from the caecum and it has no known function and is thought to be a remnant from a previous time in human evolution.

3. The ColonShaped like an inverted 'U', the colon is the longest part of the large intestine.Where is the colon?The colon has four sections that are located in the abdominal cavity.-Ascending colon - starts at the caecum at the bottom right hand side of the abdomen and ascends (ie, goes upwards) towards the liver.-Transverse colon - transverse means 'across'. This part of the colon extends across the abdomen from right to left.-Descending colon - descends (goes downwards) on the left hand side of the abdomen.Sigmoid colon - it is the last part of the large intestine, and is located on the bottom left hand side of the abdomen. It is the S-shaped connection between the descending colon and the rectum.What does the colon do?Within the colon, the mixture of fibre, small amounts of water, and vitamins, etc, mixes with mucus and with bacteria that live in the large intestine - and starts to form faeces.As faeces travels through the colon, the lining of the colon absorbs the water and some vitamins and minerals.The bacteria in the colon chemically break down some of the fibre to produce nutrients for their own survival and to nourish the cells lining the colon. Thus, the fibre in your diet is extremely important to maintain the long-term health of the colon.Through Peristalsis, faeces is pushed along until the walls of the sigmoid colon contract, causing the faeces to move into the rectum(stores faeces).


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