Menstrual Cycle Flashcards
What are the four hormones in the menstrual cycle?
-Oestrogen
-Progesterone
-FSH (follicle simulating hormone)
-LH (luteinising hormone)
What is the function of Oestrogen?
Oestrogen is produced in the overuse and stimulates uterus lining growth in preparation for pregnancy
What is the function of progesterone?
Progesterone is produced in the ovaries and acts with oestrogen to bring about the menstrual cycle via maintaining uterus lining growth
(If progesterone levels drop= lining breaks down)
What does the LH hormone do?
LH is produced by pituitary gland and stimulates ovulation (the release of an egg) on day 14
What does the FSH hormone do?
FSH is produced by the pituitary gland and and causes egg to mature in one of the ovaries
In terms of a graph when do each hormone peak and decrease?
O= increases stage 2 decreases stage 4
P=increases stage 4 drops restarts cycle
LH= peaks day 14 release egg stage 3
FSH peaks on stage 3 but lower than LH
What is the first stage of the menstrual cycle?
FSH released by pituitary gland travels in blood to ovaries where it causes an egg to mature, triggering ovaries to make oestrogen
Once the game ovaries have been triggered to start making oestrogen, what is the next stage in the menstrual cycle?
Oestrogen causes lining of uterus to be thick and stops pituitary gland from releasing more FSH (negative feedback)
What happens once oestrogen has thickened the uterus lining?
LH is released by pituitary gland triggers ovulation and releases a mature egg due to high oestrogen levels triggering spike in LH
What happens once the mature egg has been released?
Progesterone is released from ovaries, stopping the pituitary gland from releasing more LH or FSH which prevents other eggs maturing and maintains a thick uterus lining incase a fertilised egg plants
What is the last stage of the menstrual cycle?
Levels of progesterone drop so if there is no fertilised egg dropping lining and egg will result in period/ bleeding
