air sac

简明释义

气囊;

英英释义

例句

1.The structure of the air sac is essential for the respiratory system of birds.

鸟类的气囊结构对其呼吸系统至关重要。

2.Inflating the air sac allows the balloon to float in the air.

给气囊充气使气球在空中漂浮。

3.When diving, the dolphin uses its air sac to control buoyancy.

潜水时，海豚利用其气囊来控制浮力。

4.The bird's vocalization is produced by the air sac, which acts as a resonating chamber.

鸟类的鸣叫是由气囊产生的，它充当共鸣腔。

5.In frogs, the air sac helps in amplifying their mating calls.

在青蛙中，气囊有助于放大它们的求偶叫声。

作文

The respiratory system of birds is a fascinating subject, particularly due to the unique structure of their lungs and the presence of specialized air sacs. These structures, known as air sacs (气囊), play a crucial role in the efficient breathing process of birds. Unlike mammals, birds have a highly adapted respiratory system that allows for a continuous flow of air through their lungs. This adaptation is essential for meeting the high metabolic demands of flight. Birds possess several air sacs (气囊) located throughout their bodies, including in the thorax and abdomen. These sacs are not involved in gas exchange directly; instead, they serve as bellows that facilitate the movement of air through the lungs. When a bird inhales, air flows into the air sacs (气囊) before it reaches the lungs. This process allows for a more efficient exchange of oxygen and carbon dioxide, as fresh air passes through the lungs continuously, even during exhalation.One of the most remarkable features of the avian respiratory system is the unidirectional airflow. As birds breathe, air moves in one direction through the lungs, which maximizes oxygen absorption. The air sacs (气囊) help achieve this by acting as reservoirs for air. During the first inhalation, air fills the posterior air sacs (气囊), and during the first exhalation, this air moves into the lungs where gas exchange occurs. In the second inhalation, the previously used air is pushed into the anterior air sacs (气囊), and during the second exhalation, it is expelled from the body. This two-cycle breathing process ensures that birds can extract oxygen efficiently, which is vital for their high-energy lifestyle.The evolution of air sacs (气囊) is believed to have provided birds with a significant advantage over other animals. The ability to maintain a constant supply of oxygen-rich air allows birds to sustain prolonged flights and engage in high-energy activities such as hunting and migration. In addition, the lightweight structure of air sacs (气囊) contributes to the overall lightness of birds, making flight easier and more efficient.Research on air sacs (气囊) has also provided insights into the evolutionary link between birds and reptiles. Fossil evidence suggests that some dinosaurs may have possessed similar structures, indicating that the respiratory adaptations seen in modern birds may have originated long ago. Understanding the function of air sacs (气囊) not only sheds light on avian physiology but also enhances our knowledge of evolutionary biology.In conclusion, the study of air sacs (气囊) in birds reveals the intricate adaptations that enable these creatures to thrive in their environments. Their unique respiratory system, characterized by the presence of air sacs (气囊), allows for efficient gas exchange and supports the high energy demands of flight. The evolutionary significance of these structures provides a fascinating glimpse into the history of life on Earth, illustrating how organisms adapt to their ecological niches. As we continue to explore the complexities of avian biology, the role of air sacs (气囊) will undoubtedly remain a key area of interest for scientists and nature enthusiasts alike.

鸟类的呼吸系统是一个引人入胜的主题，特别是由于它们肺部的独特结构和特殊的气囊。这些被称为air sacs（气囊）的结构在鸟类高效的呼吸过程中发挥着至关重要的作用。与哺乳动物不同，鸟类拥有高度适应的呼吸系统，使空气能够在它们的肺部中持续流动。这种适应性对于满足飞行的高代谢需求至关重要。鸟类在其身体各处都有几个air sacs（气囊），包括胸腔和腹部。这些囊并不直接参与气体交换；相反，它们作为风箱，促进空气在肺部的移动。当鸟类吸气时，空气流入air sacs（气囊），然后才到达肺部。这个过程使得氧气和二氧化碳的交换更加高效，因为新鲜空气在呼气时仍然通过肺部持续流动。鸟类呼吸系统最显著的特征之一是单向气流。当鸟类呼吸时，空气以单一方向流动通过肺部，从而最大限度地提高氧气的吸收。air sacs（气囊）通过作为空气的储存库来实现这一点。在第一次吸气时，空气充满后air sacs（气囊），而在第一次呼气时，这些空气进入肺部进行气体交换。在第二次吸气时，之前使用过的空气被推入前air sacs（气囊），而在第二次呼气时，它被排出体外。这种两周期的呼吸过程确保鸟类能够有效提取氧气，这对它们的高能量生活方式至关重要。air sacs（气囊）的进化被认为为鸟类提供了显著的优势。能够保持持续供应富含氧气的空气使鸟类能够维持长时间的飞行，并参与高能活动，如捕猎和迁徙。此外，air sacs（气囊）的轻质结构有助于鸟类的整体轻盈，使飞行更加容易和高效。对air sacs（气囊）的研究还提供了鸟类与爬行动物之间进化联系的见解。化石证据表明，一些恐龙可能具有类似的结构，表明现代鸟类所见的呼吸适应可能早在很久以前就已经出现。理解air sacs（气囊）的功能不仅阐明了鸟类生理学，还增强了我们对进化生物学的认识。总之，对鸟类中air sacs（气囊）的研究揭示了使这些生物能够在其环境中繁荣发展的复杂适应性。它们独特的呼吸系统，以air sacs（气囊）的存在为特征，使得气体交换高效，并支持飞行的高能需求。这些结构的进化意义为我们提供了对地球生命历史的迷人一瞥，展示了生物如何适应其生态位。随着我们继续探索鸟类生物学的复杂性，air sacs（气囊）的作用无疑将继续成为科学家和自然爱好者关注的关键领域。