132646
Descrição
Mapa Mental por harry_bygraves, atualizado more than 1 year ago
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Criado por harry_bygraves
mais de 11 anos atrás
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Folicular phase
- The menstrual cycle begins when blood is first discharged from the uterus. From day 1 to 5, the
uterine line continues to break down and is discharged along with varying amounts of blood. A
day before menstruation occurs, the hypothalamus produces, gonadotrophin-releasing hormone
(GnRH). GnRH triggers the secretion of FSH from the anterior pituitary gland
- FSH triggers the development of one or more follicles in
the ovary. This is a ball of cells in the ovary containing an
oocyte. As an ovarian follicle grows in size, it secretes an
increasing amounts of oestrogens
- Oestrogen stimulate the repair and gowth of the uterine lining, and the
growth of milk-producing tissues in the mammary glands. During the
follicular phase, oestrogens are at low concentrations. they inhibit
further production of FSH, so that usually only one follicle matures at a
time. This is an example of negative feedback; FSH stimulates the
production of oestrogen, and oestrogen inhibit the production of FSH.
Oestrogen also stimulates the anterior pituitary gland to secret LH.
Most of the LH is stored in the anterior pituitary gland during the
follicular phase, but some LH is released into the blood and stimulates
the mature ovarian folicule to produce another hormone progesterone.
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