About two years before you notice any changes in your brain begin to work that eventually will turn you from a child into adulthood.
Two parts of the brain called the (hy-po-thal-a-mus) and the hypothalamic pituitary (pit-u-it-ary) glands begin to make more of several hormones including growth hormone, LH (lute-in-ising hormone) and FSH (follicle stimulating hormone). These hormones act on other parts of your body to make change happen.
Both boys and girls have these hormones, but they act on different parts of their bodies.
Hormones are chemicals made by one part of the body (glands a) to act on different parts, such as bone. For instance gland in your brain makes growth hormone, and works by making your foot, leg and arm bones grow longer. You have a lot of hormones are running in your bloodstream to do different jobs.
For boys the work of LH and FSH in the testes and adrenal glands (glands next to the kidneys) to make androgens (sex hormones) like testosterone. They also worked on the testes so that they begin to make sperm.
For girls these hormones work on their ovaries (where all the eggs they've been stored since before they were born), as well as in their adrenal glands, so they make more than female sex hormones such as estrogen (eg east-line-jen) and progesterone (pro-kidding-ter-own).
Both boys and girls have some of all these hormones but boys have more androgens and women have more estrogen, and different levels of this hormone make a difference in their body.
This is the action of these hormones to get your body ready for adult life we call puberty.
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