| Digestive
Chart: The Mouth |
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| Saliva also |
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| contains |
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| water, |
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| electrolytes, |
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| mucus and |
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| serous fluid, |
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| lysozyme. |
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| Presso- |
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| receptors |
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| and chemo- |
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| receptors |
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| respond to |
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| presence of |
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| substances |
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| in the mouth. |
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