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what is the reproductive hormone in men and where is it produced?
testosterone produced in the testes
what do the testes stimulate?
sperm production
what is the reproductive hormone in women and where is it produced?
oestrogen in the ovaries
which 4 hormones are involved in the menstrual cycle?
oestrogen, progesterone, luteinising hormone, follicle-stimulating hormone
what is average duration of the menstural cycle?
28 days
what happens in stage one (menstruation) of the menstrual cycle?
the uterus lining breaks down for 4 days
what happens in stage 2 of the menstrual cycle?
the uterus lining builds up again from day 4 to day 14 to form a thick, spongy layer with many blood vessels. bit prepares for a fertilised egg
what happens in stage 3 (ovulation) of the menstrual cycle?
the egg is released from the ovary
what happens in stage 4 of the menstrual cycle?
the uterus lining is maintained for 14 days. if no fertilised egg reaches the uterus by day 28, the lining breaks down and the cycle repeats
why does oestrogen increase in stage 2?
it causes the lining to grow
why does progesterone increase in stage 4 and what happens if the levels drop?
it maintains the uterus lining. if levels drop, the lining breaks down
where are LH and FSH produced?
pituitary gland
what does FSH do?
stimulates the egg to mature in one of the ovaries
what does LH do?
stimulates the release of an egg on day 14
what does FSH do to the ovaries?
stimulates them to produce oestrogen
what does oestrogen inhibit then stimulate?
inhibits FSH and stimulates LH
what does progesterone inhibit?
FSH and LH
