Major parts of the digestive system
oesophagus: carries food from mouth to stomach. Made up of a thick muscular wall.
stomach: a muscular sac, producing enzymes. It stores and digests food (proteins). Glands in stomach wall produce mucus. Mucus prevents stomach being digested by its own enzymes.
small intestine: a long muscular tube, to further digest food, by enzymes, produced by its walls. Walls of small intestine, folded into villi, for large surface area. There are microvilli on the epithelial cells of each villus.
large intestine: absorbs water from secretions of digestive glands. The food thickens to form faeces.
rectum: final section of intestines. Faeces are stored and removed by egestion.
salivary glands: pass secretions to the mouth. Secretions contain amylase which breaks down starch into maltose.
pancreas: large gland, below the stomach. Produces pancreatic juice, containing protease, lipase and amylase.
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