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.
The blood that flow through the skin and subcutaneous area controls our body temperature. Body temperature is governed by the hypothalamus, a very small organ near the base â¦ of the brain. Perspiration is the secondary cooling control, that works evaporatively to keep the body temperature from getting too high.+ 5 others found this useful.rain. There is no specific body part that is made for controlling body temperature, and brain controls all the functions of the body, so it also controls the body temperature â¦ . 4 people found this useful.