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Theesophagusisopenedby pressureofthefoodthisallows

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Unformatted text preview: Gland 5. Sublingual Gland 6. Lymph Nodes 7. Molar Gland Masseter muscle Parotid Duct Parotid gland Submandibular gland Sublingual gland Submandibular Duct 5 Openings into the Pharynx 5 Openings into the Pharynx 1. 2. 3. 4. 5. Mouth Left and right nasal passages Eustachian tubes (connect middle ear to the throat) Larynx Esophagus Swallowing Swallowing Is a reflex. When the mouth closes, the soft palate is pushed superiorly and closes the nasal passages A sphincter valve closes off the eustachian tubes The glottis closes and respiration stops. The glottis also bends and closes the entrance into the larynx. The esophagus is opened by pressure of the food. This allows the epiglottis to open. Food then enters the esophagus. Teeth Teeth Very similar to bone. Three major components: 1. hydroxyapatite Ca (PO ) (OH) 2. bone collagen 3. cells 5 43 The pH of the mouth is usually 7.2 There are acids in the mouth that come from three sources: 1. stomach acid during vomiting 2. foods 3. waste products...
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