Search results
Results from the WOW.Com Content Network
Eurycomanone is thought to be central to the sex-hormone increasing effects of Eurycoma longifolia supplementation. In vitro, eurycomanone has been shown to enhance testosterone steroidogenesis through its inhibitory effects on aromatase, presumably causing testosterone production to increase to restore downstream estrogen homeostasis.
The onset of puberty is controlled by two major hormones: FSH initiates spermatogenesis and LH signals the release of testosterone, [19] an androgen that exerts both endocrine activity and intratesticular activity on spermatogenesis. LH is released from the pituitary gland, and is controlled by pulses of gonadotropin-releasing hormone.
Leydig cells release a class of hormones called androgens (19-carbon steroids). [8] They secrete testosterone, androstenedione and dehydroepiandrosterone (DHEA), when stimulated by the luteinizing hormone (LH), which is released from the anterior pituitary in response to gonadotropin releasing hormone which in turn is released by the hypothalamus.
Thus, spermatogenesis is the male version of gametogenesis, of which the female equivalent is oogenesis. In mammals it occurs in the seminiferous tubules of the male testes in a stepwise fashion. Spermatogenesis is highly dependent upon optimal conditions for the process to occur correctly, and is essential for sexual reproduction.
Because its main function is to nourish developing sperm cells through the stages of spermatogenesis, the Sertoli cell has also been called the "mother" or "nurse" cell. [10] Sertoli cells also act as phagocytes, consuming the residual cytoplasm during spermatogenesis. Translocation of cells from the basal lamina to the lumen of the ...
An average adult testicle measures up to 5 cm × 2 cm × 3 cm (2 in × 3 ⁄ 4 in × 1 + 1 ⁄ 4 in). The Tanner scale , which is used to assess the maturity of the male genitalia, assigns a maturity stage to the calculated volume ranging from stage I, a volume of less than 1.5 cm 3 ; to stage V, a volume greater than 20 cm 3 .
Signaling Pathway in Gonadotropic Cell Initiated by GnRH Binding to GnRHR. One factor that has an important effect on this electrical activity of gonadotrophs is the gonadotropin-releasing hormone (GnRH). GnRH is a hormone released by the hypothalamus, and it is responsible for signaling gonadotrophs to release gonadotropins FSH and LH.
A spermatozoon (/ s p ər ˌ m æ t ə ˈ z oʊ. ən, ˌ s p ɜːr m ə t ə-/; [1] also spelled spermatozoön; pl.: spermatozoa; from Ancient Greek σπέρμα (spérma) 'seed' and ζῷον (zôion) 'animal') is a motile sperm cell produced by male animals relying on internal fertilization.