The adrenaline master now comes as a snuggly 10.5" x 8" x 3.5" adrenal plush toy! Learn more about this thrill-seeking adrenaline junkie/cortisol champion with the accompanying educational booklet hangtag. The adrenal glands sit atop your kidneys and work with the hypothalamus and pituitary glands to regulate metabolism, stress and immunity. Most famously, the adrenal glands squish out the hormone adrenaline, which controls the body's fight or flight response by speeding up your heart rate and otherwise pumping you up. Safe for age 3 and up.