Adrenaline is a hormone produced by adrenal glands during high-stress or physically exhilarating situations, triggering the body's 'fight or flight' response.
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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.