Question

What name is given to the onset of menstruation in human females (or girls)? At what age does this occur?

Answer 1

Answer:

Menarche is the onset of menstruation. It usually occurs at around age of 12.

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Answer 2

Menarche

Explanation:

Secondary sexual characteristics are the physical changes which develop at puberty and help in distinguishing between boys and girls. Testosterone is the male sex hormone responsible for masculine secondary sexual characteristics as well as the promotion of muscle growth. Estrogen is the reproductive hormone in females that assists in development of secondary sexual characteristics of females like breast development, flaring of the hips, etc. Around the age of 12 years, females experience the onset of menstruation. It is called Menarche.