In males, which hormone is responsible for the development of secondary sexual characteristics?

Testosterone is a critical hormone in male development, particularly in the context of secondary sexual characteristics. It plays a fundamental role during puberty, contributing to the growth of facial and body hair, deepening of the voice, increased muscle mass, and changes in fat distribution. These characteristics emerge as a direct consequence of the action of testosterone on various target tissues in the body.

Additionally, testosterone influences libido and spermatogenesis, making it essential for male sexual health and reproductive functions. Although dihydrotestosterone, which is derived from testosterone, is also significant for certain aspects of male characteristics such as male pattern baldness and prostate growth, testosterone is the primary hormone responsible for the overall development of secondary sexual traits.

Progesterone and estrogen, while important in overall endocrine function and female sexual characteristics, do not play a direct role in male secondary sexual characteristics during puberty. Understanding the roles of these hormones is crucial for comprehending male hormonal physiology and developmental biology.