Combo with "Hormones of the Ovarian and Menstrual Cycles" and 1 other
Terms in this set (28)
Regulates secretion of LH and FSH by pituitary
Follicle-stimulating hormone (FSH)
Stimulates growth of ovarian follicle
Leuteinizing hormone (LH)
Stimulates growth of ovarian follicle and production of secondary oocyte/Promotes ovulation/Promotes development of corpus luteum and secretion of other hormones
Low levels inhibit pituitary/High levels stimulate hypothalamus/Promotes growth of endometrium
Estrogen and progesterone
Maintain endometrium/High levels inhibit hypothalamus and pituitary/Sharp drops promote menstruation
pituitary gland and ovary
The ovarian cycle is controlled by hormones from the
anterior pituitary gland
FSH and LH are secreted from the
As the follicle grows, they begin to secrete
posterior pituitary gland
At the beginning of the ovarian cycle, the release of estrogen stimulates the ~ to inhibit the additional secretion of FSH and LH; later it shifts to negative feedback
midway in the ovarian cycle, the follicle secretes more estrogen which triggers ovulation
After ovulation, the remaining follicles form the
estrogen and progesterone
After ovulation, the corpus luteum continues to secrete
A hormone secreted by the hypothalamus during preovulation, which causes the release of the pituitary hormones (LH and FSH)
FSH and LH
Hormenes that stimulate oocytes to develop and ovaries to release estrogen and progesterone
Estrogen and progesterone stimulates the development of the
Hormone produced early in pregnancy by the placenta and releases estrogen and progesterone to inhibit the release of FSH, LH and GnRH sign of pregnancy
Day 1 (Follicular Phase)
GnRH released from Hypothalamus stimulates FSH and LH secretion by anterior pituitary
FSH and LH stimulate
follicle growth and maturation
Rising levels of oestrogen plasma levels...
exert negative feedback on hypothalamus and inhibit release of FSH and LH. The pituitary instead synthesizes and stores them. The dominant follicles survives dip but other follicles deteriorate
Higher oestrogen levels secreted by the dominant follicle
results in a positive feed back which stimulates a sudden burst of the accumulated LH and to a lesser extent the FSH from the anterior pituitary.
The sudden rise in LH mid cycle results in
-The decline of oestrogen levels
- The transformation of the ruptured follicle into the corpus luteum
(Luteal Phase) Progesterone produced by the corpus luteum serves to
enrich the functional layer of the endometrium (the stratum functionalis) to receive the embryo. If fertilisation doesn't occur the corpus luteum breaks down and the functional layer begins to shed.
Proliferative phase (Follicular Phase)
5 to 14 days - This phase begins immediately following menstruation. After menses, the endometrium is very thin. The endometrium will increase in size by six to eight times.
Becomes very thick and vascular, and the glands elongate. Oestrogen is secreted which replaces and repairs the endometrium lining that was shed during menses.
Secretory Phase (Luteal Phase)
10 days - Beginning after ovulation, enrichment of blood supply and glandular secretion of nutrients prepare the endometrium to receive the embryo. During this phase the Corpus Luteum is formed on the ovary and secretes progesterone. Progesterone is the hormone responsible for building up and preparing the endometrium for implantation.
The 3 phases of the Uterine Cycle are
The Menstrual Phase
The Proliferative Phase
The Secretory Phase
The 2 Ovarian Phases are the
Oestrogens, at low levels inhibit FSH and LH and stimulate the pituitary to synthesise and store FSH and LH
Oestrogens at high levels stimulate hypothalamus to release GnRH (positive feedback) and nterior pituitary to release the stored LH, and FSH
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Hormonal Regulation of Ovarian Cycle and Uterine Cycle