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七年级生物下册4.11.3皮肤与汗液分泌知识梳理（新版）北师大版.doc

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1皮肤与汗液的分泌一、知识结构1、一位同学在削铅笔时不小心划破了手指，流出了血或感觉到了疼痛，那至少伤到了皮肤的真皮。2、汗腺包括分泌部和导管两部分。排汗不仅起到排泄作用，还可以调节体温。3、皮肤包括表皮和真皮位置 构成 厚度 结构及作用表皮 外 上皮组织 较薄 无血管。角质层（保护），生发层（分裂产生新细胞）真皮 内 结缔组织 较厚弹性纤维和胶原纤维弹性和韧性丰富的毛细血管运输、调节体温神经末梢感受外界刺激附属结构：毛发、汗腺、皮脂腺、指（趾）甲等

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