What classification of hormones is secreted from the adrenal medulla and includes epinephrine?

The classification of hormones secreted from the adrenal medulla that includes epinephrine is catecholamines. These hormones are derived from the amino acid tyrosine and play a critical role in the body’s response to stress or emergencies, often referred to as the "fight or flight" response. In addition to epinephrine, norepinephrine is another key catecholamine produced by the adrenal medulla.

Catecholamines are characterized by their structure, which includes a catechol group and an amine group. They act quickly to increase heart rate, elevate blood pressure, and boost energy availability, all of which are vital during acute stress scenarios.

In contrast, peptide hormones are made up of chains of amino acids, while corticosteroids are steroid hormones produced by the adrenal cortex involved in a variety of physiological processes, including metabolism and immune response. Gonadotropins are hormones that stimulate the gonads; these include luteinizing hormone (LH) and follicle-stimulating hormone (FSH), primarily involved in reproductive processes. Thus, catecholamines are distinct in both their origin and function, making this classification the correct answer.