HB+Contraceptives+Research

=Contraceptives/Birth Control Pill, Patch, Shot: How do they work? (331)=

FROM WIKIPEDIA
Birth control, sometimes synonymous with contraception, is a regimen of one or more actions, devices, or medications followed in order to deliberately prevent or reduce the likelihood of pregnancy or childbirth. Contraception may refer specifically to mechanisms which are intended to reduce the likelihood of the fertilization of an ovum by a spermatozoon. Birth control is commonly used as part of family planning. The history of birth control began with the discovery of the connection between coitus and pregnancy. The oldest forms of birth control included //coitus interruptus//, pessaries, and the ingestion of herbs that were believed to be contraceptive or abortifacient. The earliest record of birth control use is instructions on creating a contraceptive pessary from Ancient Egypt. Different methods of birth control have varying characteristics. Condoms, for example, are the only method that provides significant protection from sexually transmitted diseases. Cultural and religious attitudes on birth control vary significantly.

FROM http://kidshealth.org/teen/sexual_health/contraception/contraception_patch.html
PATCH: The birth control patch is a thin, beige, 1¾-inch (4½-centimeter) square patch that sticks to the skin. It releases hormones through the skin into the bloodstream to prevent pregnancy. Hormones are chemical substances that control the functioning of the body's organs. The combination of the hormones progesterone and estrogen in the patch prevents ovulation (the release of an egg from the ovaries during a girl's monthly cycle). If an egg isn't released, a girl can't get pregnant because there's nothing for a guy's sperm to fertilize. //The birth control patch is a thin, beige, 1¾-inch (4½-centimeter) square patch that sticks to the skin. It releases hormones through the skin into the bloodstream to prevent pregnancy. Hormones are chemical substances that control the functioning of the body's organs.// //The combination of the hormones progesterone and estrogen in the patch prevents ovulation (the release of an egg from the ovaries during a girl's monthly cycle). If an egg isn't released, a girl can't get pregnant because there's nothing for a guy's sperm to fertilize.// SHOT: The birth control shot is a long-acting form of progesterone, a hormone that is naturally manufactured in a girl's ovaries. The shot is given as an injection in the upper arm or in the buttocks once every 3 months to protect a girl from becoming pregnant. The hormone progesterone in the birth control shot primarily works by preventing ovulation (the release of an egg during the monthly cycle). If a girl doesn't ovulate, she cannot get pregnant because there is no egg to be fertilized.