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.
This is the pressure that your blood exerts against the walls of your arteries as it flows through them. One of the functions of your kidneys is to help control your blood pressure. Blood vessels. The tubes that carry blood around your body. The main blood vessels are the arteries and the veins.Body mass index (BMI). This is a measure of your weight relative to your height.ne of the functions of your kidneys is to help control your blood pressure. Blood vessels. The tubes that carry blood around your body. The main blood vessels are the arteries and the veins. Body mass index (BMI). This is a measure of your weight relative to your height.