Progestins mimic the effects of pregnancy and thus prevent ovulation.

Question

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Progestins are a type of hormone that mimic the effects of progesterone, a hormone produced during pregnancy. Progestins work by preventing ovulation, which means that an egg is not released from the ovary and therefore cannot be fertilized by sperm. As a result, progestin-only methods of birth control, such as the progestin-only pill, implant, or injection, are highly effective at preventing pregnancy.

Progestins Mimic the Effects of Pregnancy and Thus Prevent Ovulation