皮
皮，或者叫膚，或者叫皮膚，係包住脊椎動物嘅軟層，係器官之一。皮檔住外來侵入，亦保住水份。有保暖、阻隔、感覺之用，甚至會生產維他命丁。
皮有毛，作用因物種而異，有保暖，有保護色，或者吸引異性。唔同物種，皮有厚有薄，厚皮叫革。有啲物種，好似魚同爬蟲，會生鱗保護。雀會生羽毛保護。兩棲動物，皮就可以用外界物質互換，可以滲透出入。
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