Why caecum is called blind sac?
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The caecum is called\xa0blind sac\xa0because caecum looks like a\xa0sac\xa0which has sphincter at the ileocaecal junction and it remains closed and is invisible. Hence, it is called a\xa0blind sac.\xa0The main functions of the cecum are to absorb fluids and salts that remain after completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus. The internal wall of the cecum is composed of a thick mucous membrane, through which\xa0water\xa0and salts are absorbed.