Menstrual Cycle Flashcards
(16 cards)
What are he two hormones that control the menstrual cycle?
Oestrogen
Progesterone
What is menstruation?
Breakdown of the uterus lining. It begins on day 1 of the cycle and usually lasts between 4 and 7 days.
What happens in the second week of the cycle?
The lining of the uterus is gradually built up
What is ovulation?
Ovulation is the release of an egg from an ovary, this usually takes place around day 14.
What is most likely to take place on days 14-16 of the cycle?
Fertilisation
What happens throughout weeks 3 and 4?
The lining of the uterus continues to build up
What happens if fertilisation occurs?
The lining of the uterus is maintained and menstruation does not happen
What triggers menstraution?
Falling oestrogen and progesterone
What hormone triggers ovulation?
LH
What do maturing follicle stimulate?
Oestrogen production
What does FSH stimulate?
Growth and maturation of follicles
What does increasing progesterone inhibit?
The release of FSH and LH
What yellow body releases progesterone?
Corpus luteum
What does increasing oestrogen cause?
Thickening of wall
High levels of oestrogen stimulate the release of more of what hormone?
LH
Explain how the control of the menstrual cycle is a negative feedback mechanism.
Changes caused by the release of one hormone inhibits the secretion of other hormones. For example, progesterone inhibits FSH and LH
