What substance is produced in interstitial cells and includes testosterone in its classification?

Interstitial cells, also known as Leydig cells in the male reproductive system, are primarily responsible for the production of androgens, with testosterone being the most prominent hormone in this group. Androgens are a class of hormones that play a crucial role in the development of male characteristics and reproductive functions. Testosterone specifically is important for regulating various physiological processes, including sperm production and the development of secondary sex characteristics such as facial hair and a deeper voice.

Other hormones listed, such as estrogen and progesterone, are primarily associated with the female reproductive system. Glucagon, on the other hand, is a hormone related to glucose metabolism, secreted by the pancreas, and does not relate to the function of interstitial cells. Thus, the classification of testosterone as an androgen aligns with the role of interstitial cells in producing male sex hormones.