proglottid

简明释义

英[prəʊˈɡlɒtɪd]美[proʊˈɡlɑːtɪd]

n. [无脊椎] 节片

复 数 p r o g l o t t i d s 或 p r o g l o t t i d e s

英英释义

单词用法

同义词

反义词

例句

1.Each proglottid can contain both male and female reproductive organs.

每个节片可以包含雄性和雌性生殖器官。

2.The presence of proglottids in feces is a sign of a tapeworm infection.

粪便中出现节片是绦虫感染的迹象。

3.The tapeworm's body is made up of numerous segments called proglottids.

绦虫的身体由许多称为节片的部分组成。

4.In some species, a single proglottid can produce thousands of eggs.

在某些物种中，单个节片可以产生数千个卵子。

5.As the proglottids mature, they detach from the main body of the tapeworm.

随着节片的成熟，它们会从绦虫的主干上脱落。

作文

The world of biology is filled with intriguing terms that often describe complex structures and functions in living organisms. One such term is proglottid, which refers to a segment of a tapeworm, specifically the reproductive segment that contains both male and female reproductive organs. Understanding the significance of proglottid can help us appreciate the fascinating adaptations of parasitic organisms and their roles in ecosystems. Tapeworms are flat, segmented worms belonging to the class Cestoda. They typically inhabit the intestines of various vertebrates, including humans. The body of a tapeworm is made up of numerous segments called proglottids. Each proglottid is capable of producing eggs, making them highly efficient in reproduction. This unique feature allows tapeworms to thrive in their hosts, as each segment can release thousands of eggs into the environment, increasing the chances of survival for the species. The life cycle of a tapeworm begins when an intermediate host, such as a pig or cow, ingests the eggs. Inside the host's intestine, the eggs hatch into larvae, which then attach themselves to the intestinal wall. As they grow, they develop into mature tapeworms, forming new proglottids along their bodies. This process can lead to a significant increase in the tapeworm population within a single host. Eventually, the mature tapeworm releases its proglottids into the host's feces, allowing the cycle to continue when another animal consumes the contaminated material. The structure of a proglottid is fascinating. Each segment is equipped with a set of reproductive organs, including testes and ovaries, enabling self-fertilization or cross-fertilization with other tapeworms. This reproductive strategy is crucial for the survival of the species, as it ensures genetic diversity and adaptability. Moreover, the presence of numerous proglottids allows for continuous reproduction, as older segments can detach and disperse while newer ones continue to develop. In addition to their reproductive functions, proglottids also play a role in the overall anatomy of the tapeworm. Each segment contains a scolex, or head, that is equipped with hooks or suckers, allowing the tapeworm to anchor itself firmly to the intestinal wall of its host. This attachment is vital for the tapeworm's survival, as it prevents the organism from being expelled during digestion. Understanding the role of proglottids in the life cycle of tapeworms highlights the complexity of parasitic relationships in nature. While these organisms can cause significant harm to their hosts, they also demonstrate the intricate balance of ecosystems. The study of tapeworms and their proglottids can provide valuable insights into the evolution of parasitism and the strategies these organisms employ to survive and reproduce. In conclusion, the term proglottid encapsulates a vital aspect of tapeworm biology, representing the reproductive segments that allow these parasites to flourish within their hosts. By exploring the structure and function of proglottids, we gain a deeper understanding of the complexities of life on Earth, revealing the remarkable adaptations that enable certain organisms to thrive in challenging environments. As we continue to study these fascinating creatures, we uncover not only the mysteries of their existence but also the broader implications for our understanding of biology and ecology.

生物学的世界充满了引人入胜的术语，这些术语通常描述生物体内复杂的结构和功能。其中一个术语是proglottid，指的是绦虫的一个段落，特别是包含雌雄生殖器官的生殖段。理解proglottid的重要性可以帮助我们欣赏寄生生物的迷人适应性及其在生态系统中的作用。绦虫是一种属于扁形动物门的扁平、分节的虫类。它们通常栖息在各种脊椎动物的肠道中，包括人类。绦虫的身体由许多称为proglottids的段落组成。每个proglottid都能够产生卵子，使它们在繁殖方面极为高效。这一独特特征使得绦虫能够在宿主中生存，因为每个段落可以向环境释放数千个卵子，从而增加物种的生存机会。绦虫的生命周期始于中间宿主，例如猪或牛，吞食卵子。在宿主的肠道内，卵子孵化成幼虫，然后附着在肠壁上。随着它们的生长，它们发育成成熟的绦虫，在其身体上形成新的proglottids。这一过程可能导致单个宿主体内绦虫数量的显著增加。最终，成熟的绦虫将其proglottids释放到宿主的粪便中，当其他动物摄入被污染的物质时，这一循环得以继续。proglottid的结构令人着迷。每个段落配备了一组生殖器官，包括睾丸和卵巢，使其能够自我授粉或与其他绦虫进行交配。这种繁殖策略对物种的生存至关重要，因为它确保了遗传多样性和适应性。此外，众多的proglottids的存在使得持续繁殖成为可能，因为较老的段落可以脱落并扩散，而较新的段落则继续发展。除了它们的生殖功能外，proglottids还在绦虫的整体解剖结构中发挥着作用。每个段落都包含一个吸盘或头部，配备有钩子或吸盘，允许绦虫牢牢地固定在宿主的肠壁上。这种附着对绦虫的生存至关重要，因为它防止了生物在消化过程中被排出。理解proglottids在绦虫生命周期中的作用突显了自然界寄生关系的复杂性。虽然这些生物可能会对宿主造成重大伤害，但它们也展示了生态系统的微妙平衡。对绦虫及其proglottids的研究可以提供关于寄生现象演化和这些生物为生存和繁殖所采用的策略的宝贵见解。总之，术语proglottid概括了绦虫生物学的一个重要方面，代表了使这些寄生虫能够在宿主体内繁荣的生殖段落。通过探索proglottids的结构和功能，我们可以更深入地理解地球生命的复杂性，揭示某些生物体在挑战性环境中生存的非凡适应性。随着我们继续研究这些迷人的生物，我们不仅揭开了它们存在的神秘面纱，还揭示了对我们理解生物学和生态学的更广泛影响。