Yahoo 知識+ 將於 2021 年 5 月 4 日 (美國東岸時間) 停止服務。從 2021 年 4 月 20 日 (美國東岸時間) 起,Yahoo 知識+ 網站將轉為僅限瀏覽模式。其他 Yahoo 資產或服務,或你的 Yahoo 帳戶將不會有任何變更。你可以在此服務中心網頁進一步了解 Yahoo 知識+ 停止服務的事宜,以及了解如何下載你的資料。

man 發問於 科學及數學生物學 · 1 十年前

the fuction of endometrium緊急!!!!thx!!!!!

what is the fuction of endometriumwhen the woman is giving birth ?

( use short English sentences to answer) thx^^

2 個解答

  • 1 十年前

    The endometrium functions as a lining for the uterus, preventing adhesions between the opposed walls of the myometrium, thereby maintaining the patency of the uterine cavity. During the menstrual cycle or estrous cycle, the endometrium grows to a thick, blood vessel rich, glandular tissue layer. This represents an optimal environment for the implantation of a blastocyst upon its arrival in the uterus.

    During pregnancy, the glands and blood vessels in the endometrium further increase in size and number. Vascular spaces fuse and become interconnected, forming the placenta, which supplies oxygen and nutrition to the embryo and fetus.

  • 莫愁
    Lv 6
    1 十年前

    Functions of endometrium before birth:

    (i)It provides a large surface for placenta to attach.

    (ii)Since it is continuously growing due to the action of hormones called progesterone and oestrogen, it provides a suitable place for implantation to carry out.

    (iii)It is richly supplied by blood hence it carries out material exchanges between maternal and foetus in the placenta.

    Function of endometrium during laboring:

    (i)the receptors of oxytocin increases, so that the endometrium contracts due to the hormone oxytocin produced by the neurohypophysis (posterior pituitary) during birth.

    (ii)Another hormone called progesterone produced by the corpus luteum (yellow body) also causes the endometrium to contact more violently so that it pushes the foetus out of the vigina during labor process.

    (iii)birth of placenta: the endometrium contracts continuouly after the baby is delivered. This enables the placenta attached to the endometrium is also being pushed out of the mothers uterus. This process is called birth of placenta.

    In conclusion, before birth, endometrium is a place for material exchanges between mother and her foetus and during birth, it only causes both baby and placenta to be removed out of the mother's uterus by contracting it vigorously.

    I hope you understand what I am talking about.