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.
Vacuoles are large vesicles that are derived from the Endoplasmic reticulum and Golgi apparatus. They are membrane- bound sacs and serve many functions such as storage. Animal cell vacuoles are much smaller and more numerous than plant cell vacuoles, because in plant cells, they store a great deal of water. If an animal cell performs phagocytosis, a food vacuole forms and fuses with a lysosome(containing enzymes) for furthering processing.