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Across 2. The type of chemical that controls the menstrual cycle. (7) 6. This hormone maintains the thickness of the lining of the uterus ready for a fertilised egg. (12) 9. The sort of egg that would be implanted in the lining of the uterus. (10) 10. Where a fertilised egg would be implanted. (6) 11. The hormone that causes an egg to mature in the ovary. (9) 13. This happens to the lining of the uterus if no fertilised egg is implanted. (9) 14. A more common name for menstruation. (6)

Down 1. The technical name for the lining of the uterus. (11) 3. The menstrual cycle occurs from puberty until the _________ . (9) 4. The approximate number of days the menstrual cycle lasts. (11) 5. How the lining of the uterus leaves the body when it is not needed. (12) 7. The cycle in which the lining of the uterus builds up and breaks down. (9) 8. This results when a fertilised egg implants and develops in the uterus. (9) 12. These produce the hormones oestrogen and progesterone. (7)