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The Menstrual Cycle

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The Menstrual Cycle

The menstrual cycle is a cycle of approximately 28 days. It is process in

which the uterus lining builds up in anticipation of the arrival of an egg. If the

egg is not fertilized, the uterus is shed and released in blood through the


Hormones play a key part within the menstrual cycle.


FSH  – it is produced in the pituitary gland and it causes the egg to mature

             and causes the ovaries to release oestrogen


Oestrogen  – it stops FSH from being releases and causes the uterus

                         lining to thicken. Also stimulates the pituitary gland to

                         release LH


LH  – causes the egg to be releases on day 14


Progesterone – it helps to maintain the lining of the uterus for the rest of

                              the menstrual cycle, if fertilization occurs then progesterone

                              levels remain high, if not then the progesterone levels fall

                              and the uterus lining breaks down.



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