The changes of puberty in boys, such as a deeper voice and facial hair, are driven mainly by
- A. testosterone
- B. oestrogen
- C. progesterone
- D. insulin
Explanation
Testosterone from the Leydig cells stimulates the development of male secondary sexual characteristics and continues to support sperm production. Oestrogen and progesterone are the principal female sex hormones, though small amounts occur in both sexes.