An aggregation of morphologically similar cells and associated intercellular matter acting together to perform one or more specific functions in the body. There are four basic types of tissue: muscle, nerve, epidermal, and connective.

• 组织形态上相似的细胞和相关的细胞间物质的集合，共同活动行使身体一项或多项特定功能。有四类最基本的组织：肌肉组织，神经组织，表皮组织和结缔组织