In human females, each time during menstruation and the release of an egg the inner wall of the uterus thickens. Is this thickening permanent? Give reasons.

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Solution

Menstruation:
In females, every month either of the ovaries releases an egg for fertilization to take place and the uterine wall thickens.
The uterine walls thicken to provide a cushiony surface to the implanting embryo.
However, in the absence of fertilization the uterine wall breaks, and blood and mucous come out through the vaginal passage. This phenomenon is known as menstruation.
Hence, the uterine thickening is not permanent and it takes place in every menstrual cycle.

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Q. Question 23
In human females, each time during maturation and release of an egg, the inner wall of the uterus thickens. Is this thickening permanent? Give reasons.

Arrange the following events of the menstrual cycle in correct sequence.
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c) thickening of wall of uterus
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