As the oestrogen builds up, it inhibits FSH and thickens the uterus lining. However, a high concentration of oestrogen also causes a surge in LH (lutenising hormone) from the Pituitary gland.
uterus lining = The inner layer of cells in the uterus
concentration = the amount of a substance in a space. For example, if 10ml of water is added to 50ml apple juice, the concentration is higher than if 10ml of water was added to 500ml of water, as the proportion of water in the mixture is higher.
surge = powerful increase
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