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Menstrual Cycle (Ovarian Cycle)

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Estimated time: 3 minutes
CBSE: Class 12
CISCE: Class 12

Definition: Menstrual Cycle

The rhythmic series of changes in the sex organs throughout the reproductive life of a female primate (e.g., monkeys, apes, and human beings) from puberty to menopause is called the menstrual cycle (L. mensis = month, lunar month).

Maharashtra State Board: Class 12

Key Points: Menstrual Cycle (Ovarian Cycle)

  • The menstrual cycle is a series of monthly changes in females of reproductive age.
  • The beginning of the cycle is called menarche, and its permanent stop is called menopause (around 45–50 years).
  • It occurs mainly in primates, including humans, and involves changes in the ovaries and uterus.
  • The cycle is controlled by hormones (gonadotropins and ovarian hormones) and repeats every ~28 days.
  • In the middle of the cycle, ovulation occurs, where an egg is released from one of the ovaries.

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