Germ Line Cells: Germ Cells, Spermatozoon, Gamete, Spore, Ovum, Folliculogenesis, Ovarian Cyst, Oocyte, Zona Pellucida, Germ Line Development baixar o livro de graça

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 134. Not illustrated. Chapters: Germ Cells, Spermatozoon, Gamete, Spore, Ovum, Folliculogenesis, Ovarian Cyst, Oocyte, Zona Pellucida, Germ Line Development, Isogamy, Gametogenesis, Anisogamy, Capacitation, Polar Body, Cortical Reaction, Oogonium, Acrosome, Germ Plasm, Oogamy, Hyperactivation, Spermatid, Spermatogonium, Spermatocyte, Gametangium, Perivitelline Space, Ascospore, Chlamydospore, Drosophila Bifurca, Teliospore, Urediniospore, Germline Mutation, Gametocyte, Gonocyte, Nebenkern, Gametogonium, Gametid. Excerpt: In biology, folliculogenesis is the maturation of the ovarian follicle, a densely-packed shell of somatic cells that contains an immature oocyte. Folliculogenesis describes the progression of a number of small primordial follicles into large preovulatory follicles that enter the menstrual cycle. Contrary to male spermatogenesis, which can last indefinitely, folliculogenesis ends when the remaining follicles in the ovaries are incapable of responding to the hormonal cues that previously recruited some follicles to mature. This depletion in follicle supply signals the beginning of the menopause. Note: Although the process is similar in many animals, this article will deal exclusively with human folliculogenesis. The primary role of the follicle is oocyte support. From birth, the ovaries of the human female contain a number of immature, primordial follicles. These follicles each contain a similarly immature primary oocyte. After puberty and commencing with the first menstruation, a clutch of follicles begins folliculogenesis, entering a growth pattern that will end in death or in ovulation (the process where the oocyte leaves the follicle). During post-pubescent follicular development, and over the course of roughly a year, primordial follicles that have begun development undergo a series of critical changes in char...