Gastrin is the name of the neuropeptide that carries the message of fear from the amygdala to the gut. Upon arrival in the gut, gastrin gives rise to dyspepsia — those gut-wrenching feelings of 'butterflies in the stomach' that we experience as qualms, quease, anxiety, nausea, disgust, anger, biliousness or feeling galled.

Bombesin is the name of the neuropeptide that carries the message of fear from the amygdala to the periphery of the body. Upon arrival, bombesin causes a shutdown of the blood supply to the skin, wherupon our color blanches, we get goose bumps, and we feel 'chilled out' (white as a ghost). Creepy. Shiver me timbers.

Gastrin Man Who can make your skin crawl? Who can wrench your gut? The Gastrin Man can! The Gastrin Man can cuz He floods your blood With surging waves Of foamy neuropeptides.

Gastrin Bombesin as Oil Can Harry A-Go-Go AKA Mr. GutWrench