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 membranous sacs found in plant and animal cells. Those in plant cells tend to be larger than those in animal cells. They are like storage tanks and they can contain H2O, food, waste, or enzymes. A vacuole is a membrane-bound sac in a plant cell that stores food, water and metabolic waste.acuoles are water-filled storage spaces found in cells. They are found in both animal and plant cells (but they are more common in plant cells they are also bigger in plant c â¦ ells). Vacuoles store food, collect waste products, and can help with cell shape and buoyancy.