Hormone means to "spur on". Hormones circulate in the bloodstream and are used to maintain chemical levels. There are two kinds of hormones. One type is called steroids and the other is peptides.
Nine ways to master this topic
Sometimes you simply need a fresh perspective to solve a challenge. Click here
for a random insight from history's great thinkers.
Copyright © 2013 Dictionary.com, LLC. All rights reserved.