Question

write about menstrual cycle

Answer 1

This stage is the start of the menstrual cycle, and is counted as day one of thecycle. This stage starts when the amount of progesterone and estrogen in a woman's blood drop. This causes the endometrium - the thick lining of the uterus - to leave the woman's body through menstruation



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Answer 2

Here's a information for you

What is menstruation?

Menstruation describes the female period. The menstruation cycle begins when a woman gets her periods. The menstrual blood which leaves her body are products shed from the uterus (the uterine lining also called the endometrium). During the remainder of the menstrual cycle the uterine lining regrows. It does so in preparation for pregnancy, which occurs if the egg (oocyte) a woman releases about half way through her menstrual cycle is fertilised. When fertilisation occurs, the lining stays in place to nourish the fertilised egg. When fertilisation does not occur the menstrual cycle continues and the uterine lining is shed marking the start of the woman’s next menstrual period. Women begin menstruation at an average age of 13 (called menarche) and on average continue menstruating till age 51 (called menopause).

Menstruation involves highly complex hormonal interactions. The key hormones involved in menstruation are oestrogen and progesterone (produced by the ovaries) and luteinising hormoneand follicle stimulating produced by the pituitary gland, under the influence of hormones secreted by the hypothalamus. The interactions between these organs are referred to as the hypothalamic-pituitary-ovarian axis (HPO axis).



Phases of the menstrual cycle

The menstruation cycle refers to the cycles in which a woman’s uterus grows and sheds a lining (the endometrium) which could support the development of a fertilised egg. It typically occurs in 28 day cycles, so a woman generally gets her period every 28 days. However, cycle length may be as short as 21 days or as long as 40 days in some women. The inner lining of the uterus (the endometrium) goes through three phases during the typically 28 day menstrual cycle: the menstrual phase (days 1-5), the proliferative phase (days 6-14) and the secretory phase (days 15-28).

The ovarian cycle, refers to the cycle in which a woman’s ovaries prepare an egg to be released during ovulation. It is divided into two phases: the follicular phase (days 1-14) and the luteal phase (days 15-28), during which different levels of hormones are released. These two cycle occur in a synchronised manner; day 1 of the ovarian cycle is always also day 1 of the menstrual cycle. 

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