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aSome cells have a long, slender extension of the plasma membrane, called a cilium or flagellum, which beats in a whiplike manner. This motion causes fluid to flow across the surface of an epithelium or a sperm cell to swim through the medium. 有些细胞有质膜的一个长,苗条引伸,叫纤毛或...
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The diploid pre-egg or pre-sperm cell which undergoes meiosis was originally created by the karyokinesis process called. Explain why mitosis can occur in a haploid cell, but meiosis can't. Why is it so important for sex cells to u...
that if they could copy it, they could coax any cell along the same path. Working mostly in rodents, these pioneers in so-called in vitro gametogenesis, or IVG, have since turned mice stem cellsinto sperm and eggs, including a recent success creatingeggs from the stem cellsof a male ...
Scientists discovered multipotent stem cells in scarlet sea anemones, explaining their regenerative abilities and potentially advancing human anti-aging research.
This process is regulated by hormones.A protective layer of cells known as the follicle encapsulates immature primary oocytes. On a basic level, the follicular cells and oocytes communicate with each other and with the body via the actions of hormones and growth factors. The main signal for the...
Mozes, Alan
More blood means more nutrients, and this will help you prevent any premature ejaculation problems andensures healthy sperms. Some of the components in this product will act directly on Leydig cells of the testes to boost the secretion of testosterone. ...
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