- A Testosterone, from the Leydig cells
- B Progesterone, from interstitial cells
- C Relaxin, from interstitial cells
- D Estrogen, from interstitial cells
Correct answer: A. Testosterone, from the Leydig cells
Explanation: Leydig cells of the testes secrete testosterone, which regulates the development of secondary sexual characters and spermatogenesis.
Concept context
The endocrine glands, hormone classification and mechanism of action, and negative feedback regulation.