What is "adrenals"

Usage examples of "adrenals".

My adrenals sing to me a potent tune that makes my hands tingle and raises goose bumps up my back.

Jameson, seeing the whole thing in the slow-motion vision of stimulated adrenals, irrelevantly admired the unbroken rhythm of the Cygnan running pattern as he shifted from four legs to three to two.

Cellar was, he knew, the result of his adrenals sitting up and taking notice.