Sistema Reprodutor Feminino
Autor: Natal Skeptics | Publicado: 2011-10-27T11:22:00-07:00

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O Hipotálamo secreta o hormônio GnRH que induz a hipófise anterior a secretar os hormônios LH e FSH. O FSH induz a maturação de um folículo ovariano, aumentando de tamanho e produzindo progesterona e estrógeno, com o aumento da concentração desses hormônios no organismo, a mulher passa preparar seu corpo para a gravidez, com o espessamento do endométrio (que promove ambiente propício para nidação).
O LH tem seu pico hormonal geralmente entre o décimo e décimo quarto dia e estimula o ovócito primário dentro do folículo á maturação transformando-se em ovócito secundário (haplóide) e rompendo o folículo ovariano, liberando o ovócito na tuba uterina e o corpo lúteo, que induz a produção de progesterona e estrógeno causando a inibição do FSH.O óvulo começa a maturar-se antes mesmo da mulher nascer, onde as células germinativas estimuladas pelo GnRH começam a produzir as ovogônias em seguida dividindo-se por mitose em ovócito primário, onde ficará estacionado até a menarca (marco do primeiro ciclo menstrual). Com o estimulo do FSH e LH as divisões continuam e acontece uma meiose transformando-o em ovócito secundário (Haploide).Se o ovócito secundário encontrar-se com o espermatozóide na tuba uterina, as divisões continuam e transforma-se em ovótide (Zigoto), que através de cílios enquanto continua suas divisões até tornar-se blastocisto (blástula em humanos), até chegar no útero e implantar-se no endométrio. Processo que leva em torno de 6 dias, e após a implantação promove a produção do hormônio HCG (Hormônio Gonadotrofina Coriônica), que mantém a produção de LH e assim mantendo a progesterona e estrógeno que inibe o FSH de estimular um novo folículo. Se não... o corpo lúteo se degenera, o causa a diminuição da progesterona, e para o espessamento do endométrio, que descama, causando a menstruação e parando de inibir o FSH.