• 我要登录|
  • 免费注册
    |
  • 我的丁香通
    • 企业机构:
    • 成为企业机构
    • 个人用户:
    • 个人中心
  • 移动端
    移动端
丁香通 logo丁香实验_LOGO
搜实验

    大家都在搜

      大家都在搜

        0 人通过求购买到了急需的产品
        免费发布求购
        发布求购
        点赞
        收藏
        wx-share
        分享

        Overview I

        互联网

        1112
        The placenta is a specialized pregnancy-specific structure that develops concurrently with development of the embryo and fetus. From an evolutionary perspective, the placenta was the essential factor in permitting viviparity, a reproductive strategy in which fetal development proceeds within the female reproductive tract. Viviparous species are able to provide greater protection from environmental risks and can more precisely control the development of their progeny while they reside in utero . The placenta is comprised of numerous cell types. Among the cell types are specialized epithelioid cells, called trophoblast, that possess several important functions enabling viviparous development (1 ,2 ). Trophoblast cells play key roles in protecting the embryo/fetus from noxious substances, programming maternal support, and preventing maternal immune rejection while at the same time ensuring appropriate bidirectional nutrient/waste flow required for growth and maturation of the embryo. Although placenta functions are highly conserved, species-specific elements of placenta organization and activity are evident. Consequently, placental research has benefited and will continue to benefit from a comparative approach. Each species presents experimentally valuable attributes that can be exploited to better understand the biology of the placenta and viviparity.
        ad image
        提问
        扫一扫
        丁香实验小程序二维码
        实验小助手
        丁香实验公众号二维码
        扫码领资料
        反馈
        TOP
        打开小程序