roles of oestrogen and progesterone in the menstrual cycle Flashcards
when does ovulation occur in the cycle?
day 14 and the egg travels down the oviduct to the uterus
what is ovulation?
the release of the egg
what causes menstruation?
failure to fertilise the egg
what is menstruation caused by?
the breakdown of the thickened lining of the uterus
what happens to the lining after menstruation finishes?
the lining of the uterus starts to thicken again in preparation for possible implantation in the next cycle
what is the menstrual cycle controlled by?
hormones released from the ovary and the pituitary gland in the brain
when do oestrogen levels rise?
from day 1 to peak just before day 14
what does oestrogen levels rising cause?
the uterine wall to start thickening and the egg to mature
when does progesterone stay low?
from day 1-14
when does progesterone start to rise?
once ovulation has occurred
what does the increasing levels of progesterone cause?
the uterine lining to thicken further
if progesterone levels fall what happens?
the uterine lining breaks down (menstruation)
when oestrogen levels rise what does it stop?
FSH production
when oestrogen levels rise what does it stimulate?
LH production in the pituitary gland
what stimulates ovulation?
LH
