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.
Vacuole. In both plant and animal cells, the vacuole stores materials like food, water, and enzymes for metabolism. The plant cell also contains a central vacuole, which stores all of â¦the above but also waste and other materials. Vacuoles store water and dissolved minerals in a cell. Vacuoles are sac-like structures that are surrounded by a membrane and are found in plant and fungi cells.