液泡（Ⅴacuole）是由单层膜与其内部的细胞液组成的细胞器，主要存在于植物细胞中。低等动物特别是单细胞动物的食物泡、收缩泡等也属于液泡。[1]
液泡不是植物细胞的特有结构，只不过是植物细胞的液泡较大、液泡之间差别也较大；而动物细胞的液泡较小、液泡之间差别也不显著；或有的动物细胞的液泡不明显。因而课本里的动物细胞亚显微结构模式图上不画上液泡。但不能说动物细胞没有液泡，更不能说液泡是植物细胞的特有结构。早在30年代已提出了液泡系的概念，它包括高尔基液泡、溶酶体、圆球体、微体、自体吞噬泡、残质体、胞饮泡、吞噬泡、糊粉泡、中央泡、收缩泡等。认为凡是由膜包围的小泡或液泡都可算做液泡系内，它们是动植物细胞的组成分之一。
Vacuoles are organelles composed of a monolayer membrane and the cell fluid inside, mainly found in plant cells. Food vesicles and contractile vesicles of lower animals, especially single-celled animals, also belong to vacuoles. [1]
Vacuoles are not the unique structure of plant cells, but the vacuoles of plant cells are larger and the differences between vacuoles are also large; while the vacuoles of animal cells are smaller and the differences between vacuoles are not significant; or the vacuoles of some animal cells are not obvious. Therefore, vacuoles are not drawn on the animal cell submicrostructure model diagrams in textbooks. But it cannot be said that animal cells do not have vacuoles, let alone that vacuoles are the unique structure of plant cells. As early as the 1930s, the concept of the vacuolar system was proposed, which includes Golgi vacuoles, lysosomes, spheroids, microbodies, autophagocytic vacuoles, remnants, pinocytic vacuoles, phagocytic vacuoles, aleurone vacuoles, central vacuoles, and contractile vacuoles. Soak and so on. It is believed that all vesicles or vacuoles surrounded by membranes can be counted as vacuole systems, which are one of the components of animal and plant cells.
