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有的人因激动而流泪,有的人因悲伤而流泪;有的人因无泪而烦恼,有的人因溢泪而发愁。你知道眼泪是怎么产生的吗?你知道眼泪有什么作用吗?眼泪的成分较为复杂。眼泪主要是水,由主泪腺和副泪腺分泌。泪腺持续分泌眼泪,维持眼表的正常功能。由于眼泪中的水分不能自己吸附于眼表上,因此需要眼泪中另一种重要成分来帮助,这种成分是黏蛋白,主要由结膜上的杯状细胞分泌。另外,为了防止眼泪中水分的挥发,眼泪的最外部有一
Some people shed their tears because of their excitement. Some people shed tears of grief because of their sorrows. Some people worry because they have no tears. Some people are worried about overflowing with tears. Do you know how tears came from? Do you know the role of tears? The composition of tears is more complex. Tears mainly water, the main lacrimal gland and vice lacrimal gland secretion. The lacrimal gland continues to secrete tears and maintain the normal function of the ocular surface. Since the moisture in the tear can not be adsorbed on the ocular surface itself, another important component of the tear is needed to help, which is mucin, secreted mainly by the goblet cells on the conjunctiva. In addition, in order to prevent the evaporation of moisture in the tear, the outermost part of the tear has one