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.
Growth is a very complex process, and requires the coordinated action of several hormones. The major role of growth hormone in stimulating body growth is to stimulate the liver and other tissues to secrete IGF-I. IGF-I stimulates proliferation of chondrocytes (cartilage cells), resulting in bone growth.
1 It is larger in male brains, often enlarged in the brains of sociopaths and it shrinks in the elderly. 2  BRAIN STEM: The part of the brain that connects to the spinal cord. 3  The brain stem controls functions basic to the survival of all animals, such as heart rate, breathing, digesting foods, and sleeping.