Hormones are the messengers of the body.
They are chemicals released under order of the brain, via electrical messages down nerves from the brain to different organs around the body. These hormones tell other organs to make different chemicals or to control their blood supply. Here's an example- when your brain wants to tell your heart to pump faster to help your muscles outrun the man chasing you, within microseconds, the nerve impulse has told the adrenal gland to release its hormone. This hormone is adrenaline and this takes the message to the heart as well as other organs in preparation for running. For women, PMS and menopause are two common hormone-related conditions.