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Peristaltic movement is initiated by circular smooth muscles contracting behind the chewed material to prevent it from moving back into the mouth , followed by a contraction of longitudinal smooth muscles which pushes the digested food forward .
The jejunum is the 1-2 m long , coiled mid-section of the small intestine. The ileum is the final portion of the small intestine , which leads into the large intestine. The ileum measures 2-4 m in length .
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 muscular movements of the colon, faeces is pushed along until finally, the walls of the sigmoid colon contract , causing the faeces to move into the rectum.