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 cell structure. A vacuole (/ËvÃ¦kjuËoÊl/) is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal and bacterial cells.