This is a specialized structure inside a cell. It consists of a bubble of fluid surrounded by a membrane. A vacuole, like a closet in a house, can store whatever a cell needs at the time. A cell might stash food in a vacuole before digesting it. Or a cell might use a vacuole to collect or isolate trash or toxins until they can be disposed of safely. The fluid inside a vacuole may contain proteins called enzymes that can help break down the toxins or foods stored inside. Vacuoles can also store water, which can help cells in organisms like plants to keep up their shape.