In the 1920s, walter cannon discovered that emotion-arousing incidents trigger an outpouring of from the adrenal glands.

In the 1920s, Walter Cannon discovered that emotion-arousing incidents trigger an outpouring of stress hormones from the adrenal glands. One of the stress hormones is Cortisol. Cortisol is a steroid hormone, in the glucocorticoid class of hormones. When used as a medication, it is known as hydrocortisone. It is produced in humans by the zona fasciculata of the adrenal cortex within the adrenal gland. It is released in response to stress and low blood-glucose concentration.

The missing words from your question were stress hormones. I hope this is the answer that you were looking for.

What's the question?