Puberty
Biology: Edexcel IGCSE, topic 3.5.23
Puberty
Males and females respond differently when their bodies reach puberty:

Males
- The amount of the hormone testosterone rises. This stimulates sperm production.
- Underarm, facial and pubic hair grow.
- Voice deepens.

Females
- The amount of the hormone oestrogen rises and triggers the menstrual cycle.
- Underarm and pubic hair grow.
- Breasts enlarge.