How does Yasmin work?

• A. Inhibiting ovulation, changing cervical mucus to block sperm movement, and changing the uterine lining to prevent implantation
• B. Increasing ovulation and thickening endometrium
• C. Blocking estrogen receptors in the pituitary
• D. Stimulating embryo implantation

Answer: (A)

Yasmin works through three coordinated actions that prevent pregnancy: it suppresses ovulation, thickens cervical mucus, and alters the uterine lining. The estrogen component (ethinyl estradiol) decreases the release of FSH and LH from the pituitary, which prevents the ovarian follicle from maturing and ovulation from occurring. The progestin component (drospirenone) thickens cervical mucus, making it harder for sperm to reach the uterus. It also changes the endometrium to be less receptive to implantation, reducing the chance that a fertilized egg could implant. Together, these mechanisms provide effective contraception. The other statements describe processes that do not apply to Yasmin (such as increasing ovulation, blocking estrogen receptors in the pituitary, or stimulating implantation).