allantoic stalk

简明释义

尿囊茎

英英释义

例句

1.During the early stages of development, the allantoic stalk 尿囊茎 helps in the exchange of gases between the embryo and the environment.

在发育的早期阶段，尿囊茎 allantoic stalk有助于胚胎与环境之间的气体交换。

2.The development of the embryo is closely linked to the formation of the allantoic stalk 尿囊茎, which plays a crucial role in waste management.

胚胎的发展与尿囊茎 allantoic stalk的形成密切相关，它在废物管理中起着关键作用。

3.In certain reptiles, the allantoic stalk 尿囊茎 is essential for the transfer of nutrients from the yolk sac.

在某些爬行动物中，尿囊茎 allantoic stalk对于从卵黄囊转移营养至关重要。

4.The study of the allantoic stalk 尿囊茎 can provide insights into evolutionary adaptations in various vertebrates.

对尿囊茎 allantoic stalk的研究可以提供对各种脊椎动物进化适应的见解。

5.Researchers observed that the length of the allantoic stalk 尿囊茎 can vary significantly among different species.

研究人员观察到，不同物种之间的尿囊茎 allantoic stalk长度差异显著。

作文

The study of embryonic development is a fascinating field that reveals the intricate processes involved in the formation of life. One of the key structures that play a significant role during this developmental stage is the allantoic stalk. The allantoic stalk is an essential part of the embryonic membranes in amniotes, which include reptiles, birds, and mammals. It connects the developing embryo to the allantois, a sac-like structure that serves multiple functions throughout gestation. During the early stages of development, the allantoic stalk forms as an extension of the allantois, which is derived from the mesoderm and endoderm layers of the embryo. This stalk serves as a crucial conduit for the exchange of gases and nutrients between the embryo and the surrounding environment. In many species, it also plays a vital role in waste management by collecting metabolic waste products from the embryo. As the embryo grows, the allantoic stalk becomes increasingly important for the establishment of the placenta in mammals. The placenta is a complex organ that facilitates the transfer of oxygen and nutrients from the mother to the developing fetus while removing carbon dioxide and other waste products. The allantoic stalk, therefore, provides a direct link between the embryo and the maternal blood supply, ensuring that the developing organism receives the necessary resources for growth and development.In birds and reptiles, the allantoic stalk is also crucial for the storage of nitrogenous waste, which is excreted into the allantoic fluid. This adaptation allows the embryo to conserve water and maintain a stable internal environment, which is essential for successful development within the egg. As the embryo develops, the allantois and its stalk will eventually fuse with the chorion, another embryonic membrane, to form the chorioallantoic membrane. This membrane is vital for gas exchange and nutrient absorption in avian and reptilian embryos.Understanding the role of the allantoic stalk in embryonic development not only sheds light on the complexities of life but also has implications for reproductive biology and medicine. Research into the mechanisms governing the formation and function of the allantoic stalk can provide insights into congenital abnormalities and complications during pregnancy. For instance, disruptions in the development of the allantois or its stalk may lead to conditions such as omphalocele, where the abdominal organs protrude through an opening in the abdominal wall.In summary, the allantoic stalk is a remarkable structure that exemplifies the intricate relationship between the developing embryo and its environment. By facilitating nutrient exchange, waste management, and ultimately contributing to the formation of the placenta, the allantoic stalk plays a critical role in ensuring the survival and health of the embryo. As we continue to explore the mysteries of embryonic development, the significance of structures like the allantoic stalk becomes increasingly apparent, highlighting the beauty and complexity of life itself.

胚胎发育的研究是一个迷人的领域，它揭示了生命形成过程中复杂的过程。一个在这个发育阶段中起着重要作用的关键结构是尿囊茎。尿囊茎是羊膜动物（包括爬行动物、鸟类和哺乳动物）胚胎膜中的一个重要部分。它将发育中的胚胎与尿囊连接起来，尿囊是一个囊状结构，在妊娠期间发挥多重功能。在发育的早期阶段，尿囊茎作为尿囊的延伸形成，尿囊来源于胚胎的中胚层和内胚层。这根茎作为胚胎与周围环境之间气体和营养物质交换的重要通道。在许多物种中，它在废物管理中也发挥着至关重要的作用，通过收集胚胎的代谢废物。随着胚胎的生长，尿囊茎对哺乳动物胎盘的建立变得越来越重要。胎盘是一个复杂的器官，促进母体与发育中的胎儿之间氧气和营养物质的转移，同时去除二氧化碳和其他废物。因此，尿囊茎提供了胚胎与母体血液供应之间的直接联系，确保发育中的生物体获得生长和发育所需的资源。在鸟类和爬行动物中，尿囊茎对于氮废物的储存也至关重要，这些废物被排泄到尿囊液中。这种适应使胚胎能够节约水分并维持稳定的内部环境，这对于在卵内成功发育至关重要。随着胚胎的发育，尿囊及其茎最终将与另一种胚胎膜——绒毛膜融合，形成绒尿囊膜。这个膜对于鸟类和爬行动物胚胎的气体交换和营养吸收至关重要。理解尿囊茎在胚胎发育中的作用不仅揭示了生命的复杂性，还对生殖生物学和医学有重要意义。研究控制尿囊茎形成和功能的机制可以为先天性异常和妊娠并发症提供见解。例如，尿囊或其茎的发育中断可能导致脐膨出等情况，腹部器官通过腹壁的开口突出。总之，尿囊茎是一个非凡的结构，体现了发育中的胚胎与其环境之间复杂的关系。通过促进营养交换、废物管理，并最终有助于胎盘的形成，尿囊茎在确保胚胎的生存和健康方面发挥着关键作用。随着我们继续探索胚胎发育的奥秘，像尿囊茎这样的结构的重要性变得愈加明显，突显了生命本身的美丽和复杂性。