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食物进入口腔后,经过牙齿的咀嚼和舌、两颊的翻卷搅拌,与唾液混合成为滑润的食团,再经过吞咽进入食道。这一过程,前者主要起物理的切碎作用,后者则起复杂的化学变化,它与唾液有密切的关系。食物咀嚼时间愈长,与唾液混和得愈充分,这种变化便进行得愈彻底。 唾液内含有许多种维持生命的活性物质,它含有两种神经生长因子,具有高效刺激感觉神经和交感神经生长、分化的功能。还含有腮腺素,能够营养间叶组
After the food enters the oral cavity, it passes through the chewing of the teeth and the tongue. The cheeks are rolled up and mixed with the saliva to form a slippery bolus which is then swallowed into the esophagus. This process, the former mainly from the physical shredding effect, while the latter play a complex chemical changes, it is closely related with saliva. The longer the food is chewed and the more it is mixed with saliva, the more complete the change is. Saliva contains many life-sustaining active substances, which contain two kinds of nerve growth factor, with efficient stimulation of the sensory and sympathetic nerve growth and differentiation of the function. Also contains the parotid gland, can nourish the leaf group