IGCSE Biology – Coordination and Response Practice Test

Testosterone is the male sex hormone. It’s an androgen produced mainly in the testes and is responsible for developing and maintaining male traits, especially during puberty—like facial and body hair, a deeper voice, and increased muscle and bone mass. It also supports sperm production with the help of other hormones. Estrogen is the female sex hormone (and small amounts are made in males), while insulin and glucagon control blood glucose, not sexual characteristics.