Guide. A bone density test measures the density of minerals (such as calcium) in your bones using a special X-ray. This information is used to estimate the strength of your bones.
Animal cells do have vacuoles, but they are smaller, larger in number (plant cells usually have just one or a few large vacuoles) AND serve a somewhat different purpose than those of plants.
Plant cells also contain a larger central vacuole (enclosed by a membrane) as compared to animal cells. Also, while animal cells depend on an analogous system of gap-junctions that allows communication between cells, the plant cells use linking pores in their cell wall to connect to each other and pass information.