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 in animal cells are usually small, and vacuoles in plants are using large. The pressure created by the large vacuole helps to maintain the rigid structure of the plant cell and of the plant. (A, P) Centrosomeâare small organelles found just outside the nucleus in animal cells.