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.
Also, plant cells tend to have one large central vacuole that can take up to 90% of cell volume. Animal cells tend to have one or more small vacuoles. Vacuoles contain waste materials, water, and nutrients that can be used or secreted as necessary. In plant cells, vacuoles store water and maintain turgidity of the cell. In animal cells, they store water, ions and waste.