Menarche

Definition

Menarche is the first occurrence of menstruation in a female, marking the onset of reproductive capability. It typically occurs between ages 10 and 15.

5 Must Know Facts For Your Next Test

1. Menarche signals the beginning of a female's ability to conceive and bear children.
2. The timing of menarche can be influenced by genetics, nutrition, and overall health.
3. Menarche is often accompanied by secondary sexual characteristics such as breast development and pubic hair growth.
4. Hormonal changes involving estrogen and progesterone regulate the menstrual cycle starting at menarche.
5. Pharmacological interventions may be necessary if menarche does not occur by age 16 (primary amenorrhea) or if it occurs very early (precocious puberty).

Review Questions

• What factors can influence the timing of menarche?
• Which hormones play a crucial role in regulating the menstrual cycle starting at menarche?
• At what age range does menarche typically occur?

Related terms

Amenorrhea: The absence of menstruation, which can be primary (never occurred) or secondary (ceased after occurring).

Estrogen:

A primary female sex hormone responsible for developing and regulating the female reproductive system.

Ovulation:

The phase in the menstrual cycle when an egg is released from the ovary.