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Spermatogenesis In male animals, the hypothalamus plays a crucial role of monitoring the level of testosterone in blood. Low level of the hormone indicates low testicular activity, which triggers the hypothalamus to release releasing hormone known as gonadotropin-releasing hormone GnRH. GnRH then flows to the pituitary gland and stimulates the production of luteinizing hormone LH and the follicle stimulating hormone FSH. From the pituitary gland, the luteinizing hormone surges and stimulates leydig cells present in testicles to produce testosterone.

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Advanced Search Abstract At coitus, human sperm are deposited into the anterior vagina, where, to avoid vaginal acid and immune responses, they quickly contact cervical mucus and enter the cervix. Cervical mucus filters out sperm with poor morphology and motility and as such only a minority of ejaculated sperm actually enter the cervix. In the uterus, muscular contractions may enhance passage of sperm through the uterine cavity. A few thousand sperm swim through the uterotubal junctions to reach the Fallopian tubes uterine tubes, oviducts where sperm are stored in a reservoir, or at least maintained in a fertile state, by interacting with endosalpingeal oviductal epithelium. As the time of ovulation approaches, sperm become capacitated and hyperactivated, which enables them to proceed towards the tubal ampulla. Sperm may be guided to the oocyte by a combination of thermotaxis and chemotaxis. Motility hyperactivation assists sperm in penetrating mucus in the tubes and the cumulus oophorus and zona pellucida of the oocyte, so that they may finally fuse with the oocyte plasma membrane.

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Surprising sperm Image credit: Stockxpert With every ejaculation, men produce around million sperm cells. How much do you know about these wiggly little cells? Read on for 7 surprising facts about sperm. They respond to your diet Image credit: Carolina K.

Все спят, - сказал. - Спросить некого. Придется ждать до утра или разбудить кого-нибудь из моих друзей. Но без крайней необходимости мне не хотелось бы этого делать. Интересно, что же Хилвар считает крайней необходимостью, подумал Элвин не без сарказма.

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