2.Digestion in the mouth esophagus ●Saliva&its function Nature Composition of saliva pH6.6~7.1,99%water Salivary amylase,lysozyme,salt,etc. Functions of saliva Moisten the cavity solve food;keep the mouth clean;anti-bacteria;digest starch Regulation of salivary secretion Pure neuroregulation Conditioned unconditioned reflex§ 2. Digestion in the mouth & esophagus • Saliva & its function * Nature & Composition of saliva pH 6.6~7.1, 99% water Salivary amylase, lysozyme, salt, etc. * Functions of saliva Moisten the cavity & solve food; keep the mouth clean; anti-bacteria; digest starch * Regulation of salivary secretion Pure neuroregulation Conditioned & unconditioned reflex