Question

How does mensuration occur

Answer 1

Have you ever wondered about the connection between your body's 28 day cycle and the cycle of the moon? Here's the theory. In the days before electricity, women's bodies were influenced by the amount of moonlight we saw. Just as sunlight and moonlight affect plants and animals, our hormones were triggered by levels of moonlight. And, all women cycled together. Today, with artificial light everywhere, day and night, our cycles no longer correspond to the moon. This article is dedicated to exploring menses: fact and fiction, then and now.

The philosophic foundation of the Feminist Women's Health Center is "Knowledge is Power." We believe when women have complete, unbiased information, they are empowered to make their own decisions leading to healthy whole lives. An important role of the FWHC is to provide information, resources for additional information, and give an analysis of the information we present. Here we describe a typical 28 day menstrual cycle and we begin to challenge the dominant American cultural assumptions about menses.

Consider for a moment all you've heard about menstruation. Who first told you? What did they call it? How is menstruation viewed by your culture? What taboos have influenced you? How does your partner feel about your period? What impact has advertising had on your knowledge and attitude? What is the motivation of the advertiser? Is your experience different now compared to earlier in your life?

First we'll discuss the basic biology of menstruation, then we'll look at ancient traditions.

Basic Biology: the cycle begins

Did you know that when a baby girl is born, she has all the eggs her body will ever use, and many more, perhaps as many as 450,000? They are stored in her ovaries, each inside its own sac called a follicle. As she matures into puberty, her body begins producing various hormones that cause the eggs to mature. This is the beginning of her first cycle; it's a cycle that will repeat throughout her life until the end of menopause.

Let's start with the hypothalamus. The hypothalamus is a gland in the brain responsible for regulating the body's thirst, hunger, sleep patterns, libido and endocrine functions. It releases the chemical messenger Follicle Stimulating Hormone Releasing Factor (FSH-RF) to tell the pituitary, another gland in the brain, to do its job. The pituitary then secretes Follicle Stimulating Hormone (FSH) and a little Leutenizing Hormone (LH) into the bloodstream which cause the follicles to begin to mature.

The maturing follicles then release another hormone, estrogen. As the follicles ripen over a period of about seven days, they secrete more and more estrogen into the bloodstream. Estrogen causes the lining of the uterus to thicken. It causes the cervical mucous to change. When the estrogen level reaches a certain point it causes the hypothalamus to release Leutenizing Hormone Releasing Factor (LH-RF) causing the pituitary to release a large amount of Leutenizing Hormone (LH). This surge of LH triggers the one most mature follicle to burst open and release an egg. This is called ovulation. [Many birth control pills work by blocking this LH surge, thus inhibiting the release of an egg.]

Ovulation

As ovulation approaches, the blood supply to the ovary increases and the ligaments contract, pulling the ovary closer to the Fallopian tube, allowing the egg, once released, to find its way into the tube. Just before ovulation, a woman's cervix secretes an abundance of clear "fertile mucous" which is characteristically stretchy. Fertile mucous helps facilitate the sperm's movement toward the egg. Some women use daily mucous monitoring to determine when they are most likely to become pregnant. Mid cycle, some women also experience cramping or other sensations. Basal body temperature rises right after ovulation and stays higher by about .4 degrees F until a few days before the next period.

Answer 2

Answer:

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