progesterone		The type of chemical that controls the menstrual cycle. (7)
ovaries		This hormone maintains the thickness of the lining of the uterus ready for a fertilised egg. (12)
pregnancy		The technical name for the lining of the uterus. (11)
oestrogen		A more common name for menstruation. (6)
uterus		The menstrual cycle occurs from puberty until the _________ . (9)
menstrual		This results when a fertilised egg implants and develops in the uterus. (9)
hormone		How the lining of the uterus leaves the body when it is not needed. (12)
menopause		This happens to the lining of the uterus if no fertilised egg is implanted. (9)
fertilised		The hormone that causes an egg to mature in the ovary. (9)
twentyeight		The approximate number of days the menstrual cycle lasts. (11)
period		The sort of egg that would be implanted in the lining of the uterus. (10)
endometrium		Where a fertilised egg would be implanted. (6)
breakdown		The cycle in which the lining of the uterus builds up and breaks down. (9)
menstruation		These produce the hormones oestrogen and progesterone. (7)