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77 Figure 3. Digestive system Reading 2 16. Read the text and fill in the gaps: Model : 0. A tongue B cheek C mouth D eye Ответ: 0 C. The digestive system begins with the oral cavity or the … (0)…. The oral cavity is sometimes called the buccal or … (1)… cavity. The cheeks form the walls of the oval cavity, while the lips form the … (2)… to this cavity. The mouth … (3)… the internal organs and structures, such as: the tongue, soft and hard palates, salivary glands, the teeth which … (4)… the food and chew it. The tongue extends across the floor of the oral cavity and is attached by muscles to the … (5)… jaw bone. The tongue is covered with a series of small projections called papillae which contain cells of … (6)… buds sensi‑ tive to the chemical nature of food. The tonsils are the mass of lymphatic … (7)… located in depressions of the mucous membranes in the walls of the pharynx. They act … (8)… a flter to protect the body from the invasion of microorganisms. The gums are made of fleshy tissue and surround the sockets in which the … (9)… are found. There are 32 permanent teeth, 16 in each jaw. The three pairs … (10)… salivary glands are exocrine glands. The weight of the largest of the … (11)… glands is 28 gr. The salivary glands produce fluid called saliva which contains important digestive enzymes.