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Large intestine structure
Lumen lacks villi and digestive glands but more goblet cells (mucous)
Ceacum
Short blind ended sac that joins onto the ileum with ascending colon (ileocaecal junction)
Colon
- Split into 3 sections
- Absorption of water, water-soluble vitamins and electrolytes
Rectum
- Section of colon in pelvic cavity
- Faeces stored
- Lumen has longitudinal folds enabling lining to stretch
Anus
- Internal anal sphincter has smooth muscle and involuntary control
- External anal sphincter has striated muscle and voluntary control
- Lumen has longitudinal folds enabling lining to stretch
Composition of faeces
- Water and fibre
- Dead and living bacteria
- Mucus
- Steroblinin
- Sloughed intestinal sacs
- Secretion from anal sacs