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.
Animal cells have vacuoles also, however, animal vacuoles are much smaller. Both plant and animal vacuoles serve as storage areas for water, nutrients, and wastes. There are two other organelles that have a more pronounced function in animal cells than in plant cells.