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

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Hipotálamo secreta um hormônio chamado GnRH (Gonadotropin Realising Hormone) induz a glândula pituitária (Hipófise anterior) a secretar os hormônios LH (Hormônio Luteinizante) e FSH (Hormônio Folículo Estimulante).
O Hormônio LH induz a célula de Leydig a produzir testosterona que, juntamente com a célula de sertoli que foi estimulada pelo FSH, induz a espermatogênese.A espermatogênese acontece nas gônadas, especificamente no túbulo seminífero, onde as células germinativas induzem a produção da espermatogônia que por sua vez matura-se em espermatócito primário e em seguida secundário, onde começa a meiose que resulta em duas células filhas, cada uma com 23 cromossomos, chamadas de espermátides. Em seguida passa por um processo de especialização e transforma-se em espermatozóide. O processo de maturação e especialização ocorre no túbulo seminífero e é armazenado no epidídimo. Ejaculação:&nbsp; O processo de Ejaculação antecede uma série de eventos, começando na grande maioria dos casos, por uma ereção. Processo que ocorre devido a um estimulo nervoso de natureza diversa, que promove a liberação de Óxido Nítrico (NO), substância vaso dilatadora, provocando uma maior passagem de sangue para o pênis.
Onde ocorre uma proporção diferente do convencional de, uma veia para cada duas artérias, ou seja, o sangue chega mais rápido do que sai, isso faz com que o tecido esponjoso inche causando assim a ereção. Essa ereção se prolongada com estímulo sexual geralmente físico, causa a ejaculação, processo que ocorre a liberação do sêmen, substância constituída de espermatozóides, líquido prostático (que promove ambiente estável para o espermatozóide), prostraglândinas (que induz contrações vaginais) e carboidratos para disponibilizar energia como a frutose. O ducto comum entre a urina e o sêmen chama-se uretra, o espermatozóide armazenado no epidídimo passa para o canal deferente e encontra-se na uretra junto com as outras substâncias que compõem o sêmen.