Hormones:Chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions.
Adrenal Glands: Small glands located on top of each kidney. They produce hormones that you can't live without, including sex hormones and cortisol.
Fight or Flight Response: A physiological reaction that occurs in response to threat to life. This process is governed by adrenaline.