|   |
| Once the toothpaste is out of the tube, it is awfully hard to get it back in! H.R. Haldeman - Presidential assistant to Richard Nixon  | |
|   |
| Some minds are like concrete: thoroughly mixed up and permanently set. Anon  | |
GLOSSARY
Hormones: Chemical substances secreted by a variety of body organs that are carried by the bloodstream and usually influence cells some distance from the source of production. Hormones signal certain enzymes to perform their functions and, in this way, regulate such body functions as blood sugar levels, insulin levels, the menstrual cycle, and growth. These can be prescription, over-the-counter, synthetic or natural agents. Examples include adrenal hormones such as corticosteroids and aldosterone; glucagon, growth hormone, insulin, testosterone, estrogens, progestins, progesterone, DHEA, melatonin, and thyroid hormones such as thyroxine and calcitonin.