09. Role of hormones in the menstrual cycle

Draw the hormone graph

Yes

What hormones are secreted at the beginning of the cycle? And how are they secreted?

anterior pituitary gland secretes FSH, maturing follicle secretes oestrogen

What does initial secretion of FSH do?

Stimulates maturation of primary follicle into secondary follicle

What does oestrogen do?

Stimulates LH production by anterior pituitary gland, inhibits FSH secretion, triggers endometrium rebuilding

What does LH do?

Stimulates FSH secretion, Induces ovulation on day 14, stimulates conversion of Graafian follicle into corpus luteum

What does FSH do after LH secretion?

Inhibits oestrogen production

What does the corpus luteum do?

Secretes progesterone that maintains endometrium, secretes oestrogen (but this does not stimulate LH secretions due to progesterone), inhibits secretion of FSH and LH

What hormones decrease at these of the cycle? Why?

FSH And LH due to corpus luteum degeneration, causing progesterone to decline

What does low levels of oestrogen and progesterone cause at the end of the cycle?

Endometrium to shed during menstruation