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Ovulation occurs in response to two hormones—luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Watch the animation to learn more about ovulation.
Ovulation is part of the normal menstrual cycle. It is stimulated by several different hormones during the first half of the 28-day cycle. An increase in follicle-stimulating hormone makes several follicles, each containing an egg, develop in the ovary. Later in the cycle, the follicle-stimulating hormone level drops. The female hormone estrogen then stimulates one egg to mature inside a follicle. Luteinizing hormone then stimulates the follicle to release the egg, causing ovulation.
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