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1.11

Uterine Cycle/Menstrual Cycle

TermDefinition
Three phases of menstrual cycle 1. follicular phase (preovulatory) 2. ovulation phase (mid-cycle) 3. luteal phase (postovulatory)
when does the menstrual cycle being? when estrogen and progesterone levels have fallen
the uterine endometrial functional zone cannot be sustained in absence of __________ and begins to shed (menses). This is considered to be day _______. progesterone day 0
What responds to falling estrogen and progesterone at the end of the uterine cycle? Pituitary
the pituitary increases _______ and _________ secretion LH and FSH
What does FSH do? recruits several follicles and stimulates them to enter rapid growth phase
______ and ______ together inhibit FSH secretion by a negative feed back inhibition. estrogen and inhibin
proliferation of endometrium is stimulated by ______ estrogen
Declining FSH levels progressively causes _______ of all but one follicle atresia (degradation)
Secretion of all but one follicle leads to selection of a _________, which produces high levels of ______. dominant follicle, estrogen
high levels of _______has a positive feedback (not inhibitory) effect on the gonadotropes, causing a _______ estrogen, LH surge (some FSH surge)
proliferation of ________by estrogen continues endometrium
LH surge induces __________ of the dominant follicle maturation
LH surge induces: ovulation and luteinization
Corpus luteum produces: high progesterone, low levels estrogen and inhibin
what causes feedback inhibition of LH and FSH, which brings them back to normal? high progesterone, estrogen and inhibin
high progesterone levels shifts ______ into ______ phase endometrium into secretary phase
high progesterone levels inhibits: further endometrial growth by down regulating estrogen receptors (ER)
Corpus Luteum progressively becomes less sensitive to: basal LH
Corpus Luteum dies if the _____ levels do not increase (fertilization of the egg) hCG
Corpus Luteum dies if the ______sheds (low progesterone) and cycle beings again. endometrium
Created by: megangodfrey97
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