Which structure produces hormones responsible for male characteristics and sperm?

• A. Testicles
• B. Estrogen
• C. Progesterone
• D. Testosterone

Answer: (A)

Testes are the male gonads that do two essential jobs: produce the hormone testosterone and generate sperm. Testosterone drives male characteristics such as facial and body hair, a deeper voice, and greater muscle development. It also supports the development and maintenance of male reproductive organs and, crucially, stimulates the production of sperm within the seminiferous tubules, with support from Sertoli cells. The process is regulated by signaling from the brain (GnRH from the hypothalamus prompts LH and FSH from the pituitary), where LH triggers testosterone production by the Leydig cells and FSH aids the maturation of sperm. Because this structure handles both hormone production that leads to male traits and the production of sperm, it is the correct choice. Estrogen and progesterone are female hormones produced mainly by ovaries and don’t fulfill this dual role, and testosterone is a hormone itself, not the structure that produces it.