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Adrenalin (Noun)

A catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action.

Nouns denoting body parts.

The sudden noise triggered a rush of adrenalin through her body, preparing her for a fight or flight response.
As the fire alarm blared and the building was evacuated, Mark could feel the adrenalin coursing through his veins.
Skydivers often report feeling an intense rush of adrenalin as they leap out of the plane and plummet towards the ground.
When the hikers encountered the bear on the trail, their bodies instinctively released adrenalin to prepare them for the potential threat.
The athlete relied on the surge of adrenalin before the big competition to give her the energy and drive to perform at her best.