Contraceptive pill - reproduction, Biology

Contraceptive Pill - Reproduction

About sixty million women in the world are currently using oral steroid contraceptives. These contraceptives usually consist of a synthetic estrogen combined with synthetic progesterone in the form of pills that are taken once each day for three weeks after the last day of menstrual period. This procedure causes an immediate increase in blood levels of ovarian steroids (from the pill), which is maintained for the normal duration of a monthly cycle. As a result of negative feedback inhibition of gonadotropins secretion ovulation never occurs. The entire cycle is like a false luteal phase, with high levels of progesterone, estrogen and low levels of gonadotropins.

Since the contraceptive pills contain ovarian steroid hormones, the endometrium proliferates and becomes secretory just as it does during a normal cycle. In order to prevent an abnormal growth of the endometrium, women stop taking the pill after three weeks. This causes estrogen and progesterone levels to fall, and permits menstruation to occur. The contraceptive pill is an extremely effective method of birth control, but it does have potentially serious side effects-including an increased incidence of thromboembolism, cardiovascular disorders, and endometrial and breast cancer. It has been pointed out, however, that the mortality risk of contraceptive pills is still much lower than the risk of death from the complications of pregnancy or from automobile accidents.

Posted Date: 1/16/2013 11:54:32 PM | Location : United States







Related Discussions:- Contraceptive pill - reproduction, Assignment Help, Ask Question on Contraceptive pill - reproduction, Get Answer, Expert's Help, Contraceptive pill - reproduction Discussions

Write discussion on Contraceptive pill - reproduction
Your posts are moderated
Related Questions
What is Etherification The act or process of making ether; specifically, the process by which a large quantity of alcohol is transformed into ether by the agency of a small am

Spider Naevus: It  is found on  the cheeks,  nose  and  sometimes other parts of the  face  as a central  bright-red vessel about  the size of  a pin-point with smaller vessel

Which are the beings that form the kingdom Animalia? What are the two big groups into which this kingdom is divided? The kingdom Animalia is the animal kingdom. Commonly the ki

Q. Can Serotonin used in consciousness? Serotonin complements the action of noradrenalin and acetylcholine in promoting wakefulness and cortical responsiveness. Experiments pro

Q. What is the use of Uncoated polyvinyl chloride? Uncoated polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC): PVC and PVDC are closely related plastics that are a

Explain the Character of Pulse ? A normal pulse wave has an upstroke and down stroke. Dicrotic notch present on direct arterial traces is impalpable. Figure: Arterial

Which part of the carbon cycle is responsible for the enhancing concentration of carbon dioxide in the atmosphere. The burning of fossilized products (coal and oil) of some pla

What is the Nonhuman Experimental Studies How normal brain development proceeds is essential knowledge for professionals concerned with understanding infant and young child dev

Because of developmental abnormality, the wall of left ventricle of an infant's heart is as thin as that of right ventricle. What would be its explicit effect on circulation of blo

How are the epithelial tissues classified? The epithelial tissues are classified according to the shape of the cells that form it (epithelial cells may be cuboidal, columnar, o