The menstrual cycle Flashcards
Menstrual cycle
refers to the cyclical processes occurring in the female reproductive tract in preparation for pregnancy
Ovary
site of ovulation -egg is produced and is intrinsic to the menstrual cycle ad is the reason that the ovary itself produces hormones
Uterine cavity
site of endometrium and then woman get menstruation which takes it down through cervix to then the vagina
what is the hormonal control of the menstrual cycle dependent on
release of different hormones
4 phases of menstrual cycle
1.menstruation
2.the follicular phase, 3.ovulation
4. the luteal phase.
follicular phase
post menstruation , hypothalamus release gonadotrophin- releasing hormone activates anterior pituitary releasing the stimulating (FSH) and luteinising hormone(LH)
What do the FSH and LH hormones do in the follicular phase?
wake up ovary and produces follicle(dormant egg) one egg will become dominant and supress the others and woman will only stimulate and release egg
folliculogenesis
one of the ovams start to grow and gets the ovary to produce estrogen
Theca cells
express LH receptors throughout the cycle and synthesise androgens which are transported to granulosa cells which take the androgenand stimulate them and turn them into oestrogen.
Granulosa cells
to stop producing other eggs it secrete inhibits to regulate FSH release supress the hormones to ensure only one egg is produced
Oestrogen
secretion by developing follicle promotes rapid proliferation in endometrium and stimulates endometrium
what happens after there is rapid proliferation in endometrium
Creates positive feedback loop-LH production resulting in LH surge which triggers ovulation
Luteal phase- corupus luteum
follicle releases an egg and when follicle releases an egg is supported by. The oestrogen and itself is producing
what happens after follicle releases the egg and produces oestrogen in luteal phase?
starts to produce progesterone which helps endometrium itself to prepare for pregnancy.
Progesterone
maintains that endometrium at thickness and helps it prepare for pregnancy
forms from the remains of the ovulated follicle and promotes endometrium differentiation by secreting- has negative feedback