How to Tell Crystal From Glass. Here are some quick tips on how to distinguish classic crystal from plain glass. 1  Hold up a glass to the light. 2  If the glass acts as a prism and you see a rainbow you are holding crystal. 3  If not, it is just plain glass. 4  When struck, crystal produces a musical ring.
Blood pressure is controlled by tiny muscles that line the inside of your blood vessels. These muscles allow your arteries to operate like soft rubber tubes, that expand with each beat of your heart. When these muscles throughout the vascular system [the arteries and veins that carry blood] expand, blood pressure drops.
Despite their relatively small size, our kidneys play a very large part in enabling our bodies to function properly. Their job is to regulate the balance of water and minerals in our blood stream. One of the ways that the kidneys accomplish this task is through controlling our blood pressure. The kidney controls blood pressure by expelling surplus sodium from our bodies. If the kidneys are not functioning properly and not enough sodium is excreted, blood pressure will rise.