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(5) Function : Digestion and absorption of food. (g) Large intestine : The name large intestine is due to large diameter. (1) Structure : Endodermal, approximately 1.5-1.75 metre long. (2) Parts : They are following – (i) Caecum : Spirally coiled 10-15 cm long in human and 45 cm long in rabbit. Its posterior end is present as a blind sac in abdominal cavity called vermiform appendix . Vermiform appendix is vestigeal but contains lymphatic tissue. Caecum in human is concerned with passage of food whereas in rabbit it is concerned with cellulose digestion and conduction of food. Vompyrella bacteria helps cellulose digestion. Vermiform appendix produce antibody. It is functional in ruminents and vestigeal in man. If food may collect and decay in it or intestinal worms may settle in it and causes inflammation or appendicitis in man, in such case its removed by operation known as appendictomy.

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(5) Function : Digestion and absorption of food.(g) Large intestine : The name large intestine is due to large diameter.(1) Structure : Endodermal, approximately 1.5-1.75 metre long.(2) Parts : They are following (i) Caecum : Spirally coiled 10-15 cm long in human and 45 cm long in rabbit. Its posterior end is present as a blind sac in abdominal cavity called vermiform appendix. Vermiform appendix is vestigeal but contains lymphatic tissue. Caecum in human is concerned with passage of food whereas in rabbit it is concerned with cellulose digestion and conduction of food. Vompyrella bacteria helps cellulose digestion. Vermiform appendix produce antibody. It is functional in ruminents and vestigeal in man. If food may collect and decay in it or intestinal worms may settle in it and causes inflammation or appendicitis in man, in such case its removed by operation known as appendictomy.