allantoid structure

简明释义

似香肠构造;

英英释义

例句

1.In reptiles, the allantoid structure 尿囊结构 plays a significant role in respiration.

在爬行动物中，尿囊结构在呼吸中起着重要作用。

2.The allantoid structure 尿囊结构 is derived from the mesoderm during embryonic development.

尿囊结构是在胚胎发育过程中由中胚层衍生而来的。

3.The development of the allantoid structure 尿囊结构 is crucial for waste management in embryos.

胚胎中尿囊结构的发育对废物管理至关重要。

4.Researchers found that the allantoid structure 尿囊结构 can influence the overall health of the embryo.

研究人员发现，尿囊结构可以影响胚胎的整体健康。

5.Scientists study the allantoid structure 尿囊结构 to understand its role in nutrient transfer.

科学家研究尿囊结构以了解其在营养转移中的作用。

作文

The study of embryology reveals numerous fascinating structures that play critical roles in the development of vertebrates. One such structure is the allantoid structure, which is integral to the respiratory and excretory functions of the embryo. The allantoid structure is an extra-embryonic membrane that forms during the early stages of development in amniotes, including reptiles, birds, and mammals. It originates from the hindgut of the embryo and extends into the chorion, another extra-embryonic membrane. This unique formation allows the allantoid structure to serve multiple purposes, primarily in waste management and gas exchange.In many species, the allantoid structure acts as a reservoir for nitrogenous waste, which is crucial for maintaining the internal environment of the developing embryo. As the embryo grows, it produces metabolic waste that must be effectively managed to prevent toxicity. The allantoid structure collects these wastes, allowing them to be stored until they can be safely eliminated. This function is particularly important in species that develop in eggs, where the waste cannot simply diffuse away into the surrounding environment.Moreover, the allantoid structure plays a vital role in respiration. In some species, it is richly vascularized, meaning it contains many blood vessels, which facilitates the exchange of gases between the embryo and the external environment. Oxygen from the outside can diffuse through the shell or membranes, enter the allantoid structure, and be transported to the developing embryo. Simultaneously, carbon dioxide produced by the embryo can be expelled through the same route. This dual functionality of the allantoid structure is essential for the survival of the embryo, especially in the confined space of an egg.Additionally, the evolutionary significance of the allantoid structure cannot be understated. It represents a crucial adaptation that has allowed various species to thrive in terrestrial environments. By evolving mechanisms for waste management and gas exchange, organisms could reproduce on land rather than being confined to aquatic habitats. This transition was pivotal in the evolution of life on Earth, leading to the vast diversity of terrestrial vertebrates we see today.In conclusion, the allantoid structure is a remarkable example of nature's ingenuity in embryonic development. Its roles in waste management and respiration highlight the complexity of life even at its earliest stages. Understanding the allantoid structure not only enriches our knowledge of developmental biology but also offers insights into the evolutionary processes that have shaped the biodiversity of our planet. As research continues to uncover the intricacies of these structures, we gain a deeper appreciation for the delicate balance of life and the adaptations that have enabled it to flourish across various environments.

胚胎学的研究揭示了许多在脊椎动物发育中发挥关键作用的迷人结构。其中一个结构是尿囊结构，它对胚胎的呼吸和排泄功能至关重要。尿囊结构是一个在胚胎早期发育阶段形成的额外胚外膜，存在于爬行动物、鸟类和哺乳动物等羊膜动物中。它起源于胚胎的后肠，并延伸到另一种胚外膜——绒毛膜。这种独特的形成使得尿囊结构能够发挥多重功能，主要用于废物管理和气体交换。在许多物种中，尿囊结构充当氮废物的储存库，这对维持发育胚胎的内部环境至关重要。随着胚胎的生长，它会产生必须有效管理的代谢废物，以防止毒性。尿囊结构收集这些废物，允许它们被储存，直到可以安全排出。这一功能在那些在卵中发育的物种中特别重要，因为废物不能简单地扩散到周围环境中。此外，尿囊结构在呼吸方面也发挥着重要作用。在某些物种中，它是丰富的血管化的，这意味着它含有许多血管，有助于胚胎与外部环境之间的气体交换。外部的氧气可以通过壳或膜扩散，进入尿囊结构，并被运输到发育中的胚胎。同时，胚胎产生的二氧化碳也可以通过同一路径排出。尿囊结构的这种双重功能对胚胎的生存至关重要，尤其是在蛋的有限空间内。此外，尿囊结构的进化意义也不容小觑。它代表了一种关键的适应，使各种物种能够在陆地环境中繁衍生息。通过进化出废物管理和气体交换的机制，生物能够在陆地上繁殖，而不是被限制在水生栖息地。这一转变对地球生命的进化至关重要，导致了我们今天所看到的陆生脊椎动物的广泛多样性。总之，尿囊结构是自然在胚胎发育中巧妙的例子。它在废物管理和呼吸中的作用突显了生命在最早阶段的复杂性。理解尿囊结构不仅丰富了我们对发育生物学的知识，还提供了对塑造我们星球生物多样性的进化过程的见解。随着研究继续揭示这些结构的复杂性，我们对生命的微妙平衡以及使其能够在各种环境中蓬勃发展的适应能力有了更深的理解。