... patches. Combined oral contraceptives (Ocs) Hormones direct the process of ovulation. Oestrogen and progesterone are 2 hormones that direct many of the processes surrounding the menstrual cycle. Artificial analogues of these have proven an efficient form of birth control. To prevent pregnancy a woman takes a pill daily which contains both these hormones. This is the combination pill or simply "the pill". The oestrogen works by preventing an egg of being released from the ovaries most of the time. Both the oestrogen and progesterone make the uterus a hostile environment for an embryo by causing a thinning of the uterus lining. (3) Pros and cons of hormonal contraception High reliability is a major advantage of hormonal contraception. The risk of accidental pregnancy is less than 3 %. The hormones make for lighter and more regular menstrual periods, and reduce the cramps associated with periods. They also lower the statistical risk of tubal pregnancy, pelvic ...

See this essay or coursework document in full right now