At puberty, your hormone-producing pituitary gland releases two substances into the blood – one called the Follicle Stimulating Hormone (“FSH”) and the other called the Luteinizing Hormone (“LH”). When they reach the ovaries, they stimulate the internal egg cells to grow and mature. The egg cell follicles respond to this by pumping out oestrogen. The egg cells continue to grow and when oestrogen levels peak, the production of FSH is inhibited and the pituitary gland is prompted to pump out more LH. Then the magic happens! At exactly the right time, only the most mature egg cell (the ovum) from one of the ovaries bursts out of the follicle and through the ovary wall.
This part of the cycle is called ovulation and occurs around 10-16 days before the start of a period.
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