Содержание
- 2. The gastrointestinal tract begins with the oral cavity, or mouth. The hard palate forms the anterior
- 3. The tongue extends across the floor of the oral cavity. The tongue is covered with a
- 4. The tonsils are masses of lymphatic tissue. They act as a filter to protect the body
- 5. The gums are made of fleshy tissue. There are 32 permanent teeth, 16 in each jaw
- 6. Structure of the teeth
- 7. A tooth consists of a crown, a neck and a root. The enamel is the hardest
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