allantois

简明释义

英[əˈlæntɔɪs]美[əˈlæntɔɪs]

n. [胚] 尿囊；[胚] 尿膜

复 数 a l l a n t o i d e s

英英释义

单词用法

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反义词

例句

1.The highly vascular fetal membrane that consists of the fused chorion and allantois found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.

绒毛膜尿囊由融合的绒毛膜和尿囊组成的富含血管的胎膜组织，存在于爬行类动物和鸟类的蛋壳附近，并且构成大多数哺乳动物的胎盘。

2.The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.

由融合的绒毛膜和尿囊组成的富含血管的胎膜组织，存在于爬行类动物和鸟类的蛋壳附近，并且构成大多数哺乳动物的胎盘。

3.The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.

由融合的绒毛膜和尿囊组成的富含血管的胎膜组织，存在于爬行类动物和鸟类的蛋壳附近，并且构成大多数哺乳动物的胎盘。

4.The allantois plays a crucial role in the development of the embryo by facilitating gas exchange.

在胚胎发育过程中，尿囊通过促进气体交换发挥着至关重要的作用。

5.In reptiles, the allantois helps in the storage of waste products.

在爬行动物中，尿囊帮助储存废物。

6.During chicken embryo development, the allantois is involved in the absorption of albumen.

在鸡胚胎发育过程中，尿囊参与蛋白质的吸收。

7.The allantois is derived from the embryonic mesoderm and endoderm layers.

尿囊源自胚胎的中胚层和内胚层。

8.The function of the allantois is often compared to that of the placenta in mammals.

在哺乳动物中，尿囊的功能常常与胎盘进行比较。

作文

The development of embryos in various species is a fascinating subject that unveils the complexity of life. One significant structure that plays a crucial role during embryonic development is the allantois. The allantois is an extra-embryonic membrane that forms part of the developing embryo in reptiles, birds, and mammals. It is primarily involved in the exchange of gases and the storage of nitrogenous waste. Understanding the function of the allantois provides insight into how different organisms adapt to their environments and manage waste products during early development.In reptiles and birds, the allantois develops from the hindgut and extends into the egg's albumen, where it serves multiple purposes. First, it acts as a reservoir for waste products, allowing the embryo to eliminate harmful substances without affecting its immediate environment. This is particularly important because the eggs of these animals are laid in terrestrial environments, where waste accumulation could be detrimental to the developing embryo. Additionally, the allantois facilitates gas exchange; it is richly vascularized, allowing oxygen to diffuse into the embryo while carbon dioxide is expelled.In mammals, the role of the allantois is somewhat different. While it still participates in waste management and gas exchange, it also contributes to the formation of the umbilical cord, which connects the developing fetus to the placenta. The placenta is crucial in providing nutrients and oxygen to the fetus while removing waste products. The allantois, therefore, plays an essential role in establishing this vital connection. As the fetus grows, the allantois becomes less prominent, but its initial contributions are critical for healthy development.The evolutionary significance of the allantois cannot be overstated. It represents a key adaptation that has allowed for the successful reproduction of many terrestrial vertebrates. By enabling embryos to thrive in a protective environment while efficiently managing waste and facilitating gas exchange, the allantois exemplifies how life has evolved to overcome the challenges of different habitats.Moreover, studying the allantois can provide valuable insights into developmental biology and medicine. For instance, abnormalities in the development of the allantois can lead to various congenital disorders. Understanding its normal function can help researchers identify potential causes of these conditions and develop strategies for prevention or treatment.In conclusion, the allantois is a remarkable structure that highlights the intricacies of embryonic development across different species. Its roles in waste management, gas exchange, and the formation of vital connections like the umbilical cord demonstrate the evolutionary innovations that have enabled life to flourish on land. As we continue to explore the complexities of biology, the study of the allantois remains a vital area of research that bridges our understanding of evolution, development, and health.

胚胎在不同物种中的发育是一个迷人的主题，揭示了生命的复杂性。在胚胎发育过程中，一个重要的结构是脐带。脐带是一个额外的胚外膜，形成于爬行动物、鸟类和哺乳动物的发育胚胎中。它主要参与气体交换和氮废物的储存。理解脐带的功能可以深入了解不同生物如何适应其环境并在早期发育中管理废物产品。在爬行动物和鸟类中，脐带由后肠发育而来，并延伸到蛋白质中，在那里它发挥多重作用。首先，它充当废物的储存库，使胚胎能够排除有害物质，而不影响其直接环境。这一点尤其重要，因为这些动物的卵子是在陆地环境中产下的，废物的积累可能对发育中的胚胎造成危害。此外，脐带促进气体交换；它血管丰富，允许氧气扩散到胚胎中，同时排出二氧化碳。在哺乳动物中，脐带的作用略有不同。虽然它仍然参与废物管理和气体交换，但它还帮助形成脐带，连接发育中的胎儿与胎盘。胎盘在为胎儿提供营养和氧气的同时，去除废物是至关重要的。因此，脐带在建立这种重要联系中发挥着重要作用。随着胎儿的成长，脐带变得不那么显著，但它最初的贡献对于健康发育至关重要。脐带的进化意义不容小觑。它代表了一种关键适应，允许许多陆地脊椎动物成功繁殖。通过使胚胎能够在保护环境中茁壮成长，同时有效地管理废物和促进气体交换，脐带体现了生命如何进化以克服不同栖息地的挑战。此外，研究脐带可以提供对发育生物学和医学的宝贵见解。例如，脐带发育的异常可能导致各种先天性疾病。了解其正常功能可以帮助研究人员识别这些情况的潜在原因，并制定预防或治疗策略。总之，脐带是一个非凡的结构，突显了不同物种胚胎发育的复杂性。它在废物管理、气体交换和脐带等重要连接的形成中的作用，展示了使生命能够在陆地上繁荣发展的进化创新。随着我们继续探索生物学的复杂性，对脐带的研究仍然是一个重要的研究领域，连接着我们对进化、发育和健康的理解。