Saliva - Digestive System Saliva * * * * * * * * * Moistens...

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Digestive System Saliva * Moistens the mouth * Digest a little starch and fat * Cleanses the teeth * Inhibits bacterial growth * Dissolves molecules so they can stimulate taste buds * Dilute and buffer foods * Moistens food and binds particles together to aid in swallowing * Is a hypotonic solution of 99% water and other solutes * pH of 6.8 to 7.0 Saliva Composition of Saliva * Is a hypotonic solution of 99% water and other solutes * pH of 6.8 to 7.0 Solutes in saliva * Salivary amylase- an enzyme that begins starch digestion * Lingual lipase- activated by stomach acid and digest fat after the food is swallowed * Mucus - binds and lubricates the food mass and aids in swallowing * Lysozyme- kills bacteria * Immunoglobulin A (IgA)- inhibits bacterial growth * Electrolytes - including sodium, potassium, chloride, phosphate, and bicarbonate ions Secretion of Saliva * Controlled by the parasympathetic system through the facial and glossopharyngeal nerves which promotes continuous secretion to maintain a moist oral cavity.
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Saliva - Digestive System Saliva * * * * * * * * * Moistens...

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