Menstrual Cycle

Gabrielle Gordon

Hormonal Levels Through the Cycle

The LH hormone helps regulate the menstrual cycle and egg production. The LH and FSH hormone levels rise and fall together during the monthly menstrual cycle. The FSH hormone helps control the menstrual cycle and the production of eggs in the ovaries. The hormone is highest just before she releases an egg, which is during ovulation. Estrogen and Progesterone is low on the first day of the menstrual cycle, which signals the pituitary gland to produce more FSH hormones.
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Endometrial Lining Changes Due To Hormones

The endometrium changes throughout the menstrual cycle in response to hormones. During the first part of the cycle, the hormone estrogen is made by the ovaries. Estrogen causes the lining to grow and thicken to prepare the uterus for pregnancy. In the middle of the cycle, an egg is released from one of the ovaries (ovulation). Following ovulation, levels of another hormone called progesterone begin to increase. Progesterone prepares the endometrium to receive and nourish a fertilized egg. If pregnancy does not occur, estrogen and progesterone levels decrease. The decrease in progesterone triggers menstruation, or shedding of the lining. http://www.acog.org/Patients/FAQs/Endometrial-Hyperplasia

Follicular Development Based On Hormones

The released follicle stimulating hormone is carried in the bloodstream where it binds to receptors in the testes and ovaries. Using this mechanism follicle stimulating hormone, along with luteinising hormone, can control the functions of the testes and ovaries.

In women, when hormone levels fall towards the end of the menstrual cycle, this is sensed by nerve cells in the hypothalamus. These cells produce more gonadotrophin-releasing hormone which in turn stimulates the pituitary gland to produce more follicle stimulating hormone and luteinising hormone and release these into the bloodstream. The rise in follicle stimulating hormone stimulates the growth of the follicle in the ovary. With this growth, the cells of the follicles produce increasing amount of oestradiol and inhibin. In turn, the production of these hormones is sensed by the hypothalamus and pituitary gland and less gonadotrophin-releasing hormone and follicle stimulating hormone will be released. http://www.yourhormones.info/hormones/follicle_stimulating_hormone.aspx

Hormone Levels Changing During Pregnancy

Estrogen and progesterone are the chief pregnancy hormones. A woman will produce more estrogen during one pregnancy than throughout her entire life when not pregnant. The increase in estrogen during pregnancy enables the uterus and placenta to improve vascularization, transfer nutrients, and support the developing baby. Progesterone levels also are extraordinarily high during pregnancy. The changes in progesterone cause a laxity or loosening of ligaments and joints throughout the body.http://www.healthline.com/health/pregnancy/bodily-changes-during#HormonalChanges1

Endometrial Lining Changing During Pregnancy

Endometrial hyperplasia most often is caused by excess estrogen without progesterone. If ovulation does not occur, progesterone is not made, and the lining is not shed. The endometrium may continue to grow in response to estrogen. The cells that make up the lining may crowd together and may become abnormal. Following ovulation, levels of another hormone called progesterone begin to increase. Progesterone prepares the endometrium to receive and nourish a fertilized egg. If pregnancy does not occur, estrogen and progesterone levels decrease. The decrease in progesterone triggers menstruation, or shedding of the lining. http://www.acog.org/Patients/FAQs/Endometrial-Hyperplasia