News tagged with menstrual cycle
(Medical Xpress)—A research team from the Evolution and Ecology Research Centre at the University of New South Wales has found that women find men most attractive when they have approximately ten days of ...
Psychology & Psychiatry Apr 29, 2013 | 3.7 / 5 (35) | 8 |
New research indicates that women's reproductive function may be tied to their immune status. Previous studies have found this association in human males, but not females.
Obstetrics & gynaecology May 17, 2013 | not rated yet | 0 |
Since 1977, there has been a 70% increase in caffeine consumption among children and adolescents. Whether it is coffee, tea, soda, or energy drinks, our children are consuming more of it. One well documented effect of caffeine ...
Health Apr 22, 2013 | 3.5 / 5 (2) | 0
Monash Institute of Medical Research scientists have found a protein in the female reproductive tract that protects against sexually transmitted diseases (STIs) such as chlamydia and herpes simplex virus ...
Diseases, Conditions, Syndromes Feb 28, 2013 | not rated yet | 0 |
(Medical Xpress)—Scientists have identified molecular signals that control whether embryos are accepted by the womb, and that appear to function abnormally in women who have suffered repeated miscarriages.
Medical research Jan 03, 2013 | not rated yet | 0 |
The memory problems that many women experience in their 40s and 50s as they approach and go through menopause are both real and appear to be most acute during the early period of post menopause. That is the conclusion of ...
Other Jan 03, 2013 | not rated yet | 0 |
Changing hormones and nerve activity during menstrual cycle predispose women to knee injuries, researchers find
(Medical Xpress)—Hormone changes during a woman's menstrual cycle and the resulting fluctuations in nerve activity may be a major reason female athletes have more knee injuries than their male counterparts, according to ...
Health Nov 15, 2012 | not rated yet | 0 |
(Medical Xpress)—When it comes to matters of a healthy heart women may benefit more from eating oily fish than men, a new study has found.
Health Oct 12, 2012 | 5 / 5 (1) | 0 |
(Medical Xpress)—In a truly odd study undertaken by a group of OB/GYN researchers in Italy, volunteer women were judged to determine if a medical condition known as endometriosis causes those afflicted to ...
Obstetrics & gynaecology Sep 24, 2012 | 3.3 / 5 (10) | 5 |
(Medical Xpress)—New evidence from a study done by Aberdeen University showing that using frozen embryos implanted in the womb instead of those implanted fresh tends to reduce the risks for both mother and child, have led ...
Obstetrics & gynaecology Sep 04, 2012 | not rated yet | 0 |
(Medical Xpress)—Scientists have established a genetic mouse model for primary ovarian insufficiency (POI), a human condition in which women experience irregular menstrual cycles and reduced fertility, ...
Genetics Aug 30, 2012 | not rated yet | 0 |
Researchers at the Swedish medical university Karolinska Institutet have demonstrated that a growth hormone, PDGF-BB, and the blood protein EPO are involved in the development of cancer tumours and that they combine to help ...
Cancer Dec 05, 2011 | not rated yet | 1 |
Women who take the Pill tend to choose as partners men who are less attractive and worse in bed but a sounder bet for a long-term relationship, according to an unusual study published in the Proceedings of the Royal Society B ...
Other Oct 12, 2011 | 3.7 / 5 (3) | 2
The voice can reveal a lot about a person - their sex, their age, how they are feeling - and recent studies have even suggested that women's voices might also contain cues that men can read about how close they are to ovulation. ...
Medical research Sep 21, 2011 | 4.2 / 5 (5) | 1 |
Eating disorders such as anorexia and bulimia are associated with fertility problems and negative attitudes to pregnancy, according to a UK study. The research also revealed high rates of unplanned pregnancies in women with ...
Health Aug 03, 2011 | not rated yet | 0 |
The menstrual cycle is a cycle of physiological changes that occurs in fertile females. Overt menstruation (where there is blood flow from the vagina) occurs primarily in humans and close evolutionary relatives such as chimpanzees. Females of other species of placental mammal undergo estrous cycles, in which the endometrium is completely reabsorbed by the animal (covert menstruation) at the end of its reproductive cycle. This article focuses on the human menstrual cycle.
The menstrual cycle, under the control of the endocrine system, is necessary for reproduction. It may be divided into three distinct phases: menstruation, the follicular phase and the luteal phase. Ovulation defines the transition from the follicular phase to the luteal phase. The length of each phase varies from woman to woman and cycle to cycle, though the average menstrual cycle is 28 days. Hormonal contraception interferes with the normal hormonal changes with the aim of preventing reproduction.
Stimulated by gradually increasing amounts of estrogen in the follicular phase, menses slow then stop, and the lining of the uterus thickens. Follicles in the ovary begin developing under the influence of a complex interplay of hormones, and after several days one or occasionally two become dominant (non-dominant follicles atrophy and die). Approximately mid-cycle, 24-36 hours after the Luteinizing Hormone (LH) surges, the dominant follicle releases an ovum, or egg in an event called ovulation. After ovulation, the egg only lives for 24 hours or less without fertilization while the remains of the dominant follicle in the ovary become a corpus luteum; this body has a primary function of producing large amounts of progesterone. Under the influence of progesterone, the endometrium (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 sharp drops in levels of both progesterone and estrogen. These hormone drops cause the uterus to shed its lining in a process termed menstruation.
In the menstrual cycle, changes occur in the female reproductive system as well as other systems (which lead to breast tenderness or mood changes, for example). A woman's first menstruation is termed menarche, and occurs typically around age 12. The end of a woman's reproductive phase is called the menopause, which commonly occurs somewhere between the ages of 45 and 55.
For more information about Menstrual cycle, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.