Question

What causes the lining of the uterus to thicken and then to be shed during menstrual cycle?​

Answer 1

Answer:

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Explanation:

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Menstruation is one part of a woman's cycle when the lining of the uterus (endometrium) is shed. This occurs throughout a woman's reproductive life. With each monthly cycle, the endometrium prepares itself to nourish a fetus. Increased levels of estrogen and progesterone help thicken its walls.

Answer 2

Answer:Estrogen hormone causes the lining of uterus to thicken and this lining sheds due to the low levels of progesterone

Explanation:The inner lining of the uterus (endometrium) thickens during the menstruap cycle under the effect of estrogen hormone. (The cells of stratum basalis of the endometrium proliferate to form thick layer of stratum functionalis)

High levels of progesterone maintain the thickened lining of uterus during this period.

The progesterone levels decrease when fertilisation does not take place, thus ,the inner lining of the uterus sheds (because of lack of maintenance of the cells)