Which hormone is secreted from the adrenal medulla?

The correct choice is norepinephrine, as it is one of the primary hormones secreted by the adrenal medulla, which is the inner part of the adrenal glands. The adrenal medulla plays a critical role in the body's fight-or-flight response by producing catecholamines, which include both epinephrine (adrenaline) and norepinephrine (noradrenaline). These hormones work to prepare the body for rapid action in stressful situations by increasing heart rate, blood pressure, and blood flow to muscles.

Amino acid hormones, while important in various physiological processes, are not specifically secreted by the adrenal medulla. Instead, they are derived from amino acids and include a different class of hormones, such as thyroid hormones and certain neurotransmitters. Progesterone and estrogen are steroid hormones produced primarily by the ovaries and the placenta in females and have specific roles related to the reproductive system, but they do not come from the adrenal medulla. Thus, norepinephrine is uniquely associated with the adrenal medulla's function in the stress response.