Rans Flashcards
1
Q
How do hormones work in releasing an egg
A
The hormone FSH is secreted by the pituitary gland. FSH makes two things happen:
it causes an egg to mature in an ovary
it stimulates the ovaries to release the hormone oestrogen
Oestrogen
The hormone oestrogen is secreted by the ovaries. Oestrogen makes two things happen:
it stops FSH being produced - so that only one egg matures in a cycle
it stimulates the pituitary gland to release the hormone LH
LH
The hormone LH causes the mature egg to be released from the ovary.
This image shows how the level of oestrogen changes during the menstrual cycle. Progesterone is another hormone secreted by ovaries: it maintains the lining of the uterus and stays high during pregnancy.
