maintenance of female ducts, secondary sexual characteristics
progesterone
pregnancy hormone, prepares uterine endometrium, prepares breast for milk production, reduces uterine contractions
follicular phase
follicle develops, controlled by estrogen, FSH and LH, ends at ovulation
luteal phase
begins following ovulation, corpus luteum develops into a follicle and begins to secrete progestreon, ends when progesterone levels drop trigger menstruations
