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How Does Estrogen Affect the Menstrual Cycle?

ID: ANH14130S103
MEDICAL ANIMATION TRANSCRIPT: As the level of estrogen begins to rise, it causes the normally thick mucus inside the cervix to thin out. Estrogen also triggers other hormones to cause one of the ovaries to release an egg. This process is called ovulation. If a woman has sex during this time, a man's reproductive cells, called sperm, can pass through the thinner mucus to fertilize an egg. In the uterus, estrogen causes the lining to thicken, which prepares it to receive a fertilized egg.

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