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Answer:
- On day 1 of the menstrual cycle: The menstrual cycle starts with the menstrual phase in which the endometrium lining sheds away due to the absence of fertilization of an egg. In addition, the levels of progesterone and estrogen are also low during this period.
Within 4-5 days the thickness of endometrium lining decreases from around 11 millimeters to 2 millimeters. The average thickness of the endometrium during this period is around 4 millimeter.
- Proliferative phase: It follows the menstrual phase during which maturation of follicles takes place. The levels of estrogen also increase during this phase. It starts preparing the endometrium form implantation due to which the thickness of endometrium keeps on increasing.
From 5th to 14th day of the menstrual cycle (proliferative phase) the thickness of endometrium increases from 2 millimeters to 11 millimeters with an average thickness of 6-8 millimeter.
The thickness of the uterine lining is mediated by the level of estrogen in the menstrual cycle.
What is the menstrual cycle?
The rhythmic series of changes that occurs in the reproductive organs of female primates (monkeys, apes, and human beings) is called the menstrual cycle.
The first phase of the menstrual cycle, which is known as the menstrual phase, lasts for 3-5 days. During this period, the soft tissue of the endometrial lining of the uterus disintegrates and causes bleeding. The level of estrogen is comparatively low. The average length of the endometrium lining is about 2mm.
The second phase of the menstrual cycle, which is known as the proliferative phase, lasts for 10-12 days. During this period, maturation of the Graafian follicle occurs and the endometrium of the uterus is regenerated due to the secretion of LH and FSH from the anterior pituitary. The level of estrogen is found to be very high. The average length of the endometrium lining is about 8-10mm.
Therefore, in this way, the increase in the estrogen level corresponds to the change in thickness of the uterine lining on days 1 through 10 of the menstrual cycle.
To learn more about, the Menstrual cycle, refer to the link:
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