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1·The integumentary system (which includes hair and nails) is often the first place that a serious vitamin deficiency shows up.

当维生素缺乏时，首先会变现在表皮系统（包括毛发和指甲）。

2·Result: the texture of integumentary cells, the shape and size of hair socket and bristle were important characters for species identification.

结果：可根据体壁细胞的纹理、毛窝的形态、大小及刚毛的特征进行区别。

3·It includes the cardiovascular, digestive, endocrine, urinary, immune, integumentary, lymphatic, muscular, nervous, reproductive, respiratory and skeletal systems.

包括心血管，消化，内分泌，泌尿，免疫，外皮，淋巴，肌肉，神经，生殖，呼吸还有骨骼系统。

外皮的

1·It includes the cardiovascular, digestive, endocrine, urinary, immune, integumentary, lymphatic, muscular, nervous, reproductive, respiratory and skeletal systems.

包括心血管，消化，内分泌，泌尿，免疫，外皮，淋巴，肌肉，神经，生殖，呼吸还有骨骼系统。