What is MENSTRUAL CYCLE? What does MENSTRUAL CYCLE mean? MENSTRUAL CYCLE definition & explanation

the menstrual cycle is a regular natural change that occurs in the uterus and ovaries that make pregnancy possible the cycle is required for the production of opposites and for the preparation of the uterus for pregnancy up to 80% of women report having some symptoms during the one to two weeks prior to menstruation common symptoms include acne tender breasts bloating feeling tired irritability and mood changes these symptoms interfere with normal life and therefore qualify as premenstrual syndrome in 20 to 30% of women in 3 to 8% they are severe the first period usually begins between 12 and 15 years of age a point in time known as menurkey they may occasionally start as early as 8 and this onset may still be normal the average age of the first period is generally later in the developing world and earlier in developed world the typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women and 21 to 31 days in adults an average of 28 days menstruation stops occurring after menopause which usually occurs between 45 and 55 years of age bleeding usually lasts around two to seven days the menstrual cycle is governed by hormonal changes these changes can be altered by using hormonal birth control to prevent pregnancy each cycle can be divided into three phases based on events in the ovary ovarian cycle or in the uterus uterine cycle the ovarian cycle consists of the follicular phase ovulation and luteal phase whereas the uterine cycle is divided into menstruation proliferative phase and secretory phase stimulated by gradually increasing amounts of estrogen in the follicular phase discharges of blood menses flow stop and the lining of the uterus thickens follicles in the ovaries in developing under the influence of a complex interplay of hormones and after several days one or occasionally to become dominant non dominant follicles shrink and die approximately mid cycle 24 – 36 hours after the luteinizing hormone LH surges the dominant follicle releases and Nava sites in an event called ovulation after ovulation the other site only lives for 24 hours or less without fertilization while the remains of the dominant follicle in the ovary become a corpus ludo this body has a primary function of producing large amounts of progesterone under the influence of progesterone the uterine lining changes to prepare for potential implantation of an embryo to establish a pregnancy if implantation does not occur within approximately two weeks the corpus luteum will involute causing a sharp drop in levels of both progesterone and estrogen the hormone drop causes the uterus to shed its lining in a process termed menstruation menstruation also occurs in some other animals including shrews bats and other primates such as Apes and monkeys

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