Question

The first period of a girl is called ______.

Answer 1

Menarche:

1. Menarche can be defined as the first occurrence of the menstrual blood flow (period) in girls.
2. The ovaries release one egg every month, and the uterine walls become thick to nourish the fertilized egg.
3. But when fertilization (fusion of male and female gametes) does not occur, the uterine walls break and release blood and mucous through the vagina. This process is known as menstruation.

Final answer:

The first period of a girl is called menarche.