Uterine endometrium,epithelial glands,and connective tissue are broken down in the menstrual phase. This is due to:

  • A
    Over secretion of $FSH$
  • B
    Lack of oestrogen
  • C
    Lack of progesterone
  • D
    Over production of progesterone

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The following graph shows the relative concentrations of the four hormones present in the blood plasma of a woman during her menstrual cycle. Identify the hormones $A, B, C$ and $D$.

Which one of the following statements is incorrect about menstruation?

Ovulation takes place in a month between

The first menstruation is called $........$,and in humans,the menstrual cycle ceases around the age of $50$ years,which is termed as $........$.

When is the menstrual cycle not observed?

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