air sac

简明释义

气囊

英英释义

例句

1.In some reptiles, the air sac helps regulate body temperature.

在一些爬行动物中，气囊有助于调节体温。

2.Inflammation of the air sac can lead to respiratory issues in birds.

如果气囊发炎，可能会导致鸟类的呼吸问题。

3.During the breathing process, the air sac plays a crucial role in gas exchange.

在呼吸过程中，气囊在气体交换中起着至关重要的作用。

4.The bird inflated its air sac to produce a loud call.

这只鸟膨胀了它的气囊以发出响亮的叫声。

5.Fish use their swim bladders, which are similar to air sacs, for buoyancy.

鱼类使用它们的游泳膀胱，这与气囊相似，用于浮力。

作文

The respiratory system of birds is a fascinating subject that showcases the incredible adaptations these animals have made for flight. One of the key components of this system is the air sac, which plays a crucial role in their breathing process. Unlike mammals, birds have a unique respiratory system that includes multiple air sacs that allow for a continuous flow of air through their lungs. This adaptation is essential for meeting the high oxygen demands during flight.Birds have a total of nine air sacs located throughout their bodies, including the cervical, interclavicular, anterior thoracic, posterior thoracic, and abdominal air sacs. These air sacs serve as reservoirs of air, ensuring that oxygen-rich air is available at all times. When a bird inhales, air flows into the posterior air sacs, and when it exhales, the air moves into the lungs, where gas exchange occurs. This two-cycle breathing process allows birds to extract more oxygen from the air compared to mammals.The presence of air sacs also helps in regulating body temperature. During hot weather, birds can use their air sacs to cool down by evaporating moisture, similar to how sweating works in humans. This ability to thermoregulate is vital for birds, especially those living in extreme climates.Moreover, the structure of the air sacs contributes to the lightweight nature of birds. The air sacs are thin-walled and filled with air, reducing the overall weight of the bird without compromising its strength. This lightweight design is critical for flight, as it allows birds to soar through the sky with ease.In addition to their role in respiration and thermoregulation, air sacs also play a part in vocalization. Many bird species possess specialized air sacs that help produce sounds. For instance, the song of a nightingale or the call of a crow is enhanced by the vibrations of air passing through these air sacs. This feature not only aids in communication but also attracts mates during the breeding season.Understanding the function of air sacs provides insight into the evolutionary adaptations that have allowed birds to thrive in various environments. Their efficient respiratory system is a testament to nature's ingenuity, enabling birds to perform remarkable feats of endurance and agility.In conclusion, the air sac is a vital component of a bird's anatomy, integral to its respiratory efficiency, thermoregulation, and vocalization. By studying these structures, we gain a deeper appreciation for the complexities of avian biology and the remarkable adaptations that have evolved over millions of years. The next time you observe a bird in flight, take a moment to consider the intricate systems at work within its body, particularly the remarkable air sacs that make such graceful movement possible.

鸟类的呼吸系统是一个迷人的主题，展示了这些动物为飞行所做出的惊人适应。其中一个关键组成部分是气囊，它在鸟类的呼吸过程中发挥着至关重要的作用。与哺乳动物不同，鸟类拥有独特的呼吸系统，包括多个气囊，允许空气在其肺部中持续流动。这种适应对于满足飞行期间的高氧需求至关重要。鸟类体内总共有九个气囊，包括颈部、锁骨间、前胸、后胸和腹部气囊。这些气囊作为空气储存库，确保始终有富含氧气的空气可用。当鸟类吸气时，空气流入后气囊；当它们呼气时，空气则进入肺部，在那里进行气体交换。这种双循环的呼吸过程使鸟类能够从空气中提取比哺乳动物更多的氧气。气囊的存在还有助于调节体温。在炎热的天气里，鸟类可以利用其气囊通过蒸发水分来降温，这类似于人类的出汗。这种调节体温的能力对鸟类至关重要，尤其是生活在极端气候下的鸟类。此外，气囊的结构也有助于鸟类的轻量化特性。气囊壁薄且充满空气，减少了鸟类的整体重量而不影响其强度。这种轻量化设计对飞行至关重要，因为它使鸟类能够轻松地在天空中翱翔。除了在呼吸和调节体温中的作用外，气囊还在发声中发挥作用。许多鸟类物种拥有专门的气囊，帮助产生声音。例如，夜莺的歌声或乌鸦的叫声通过空气在这些气囊中的振动得以增强。这一特征不仅有助于交流，还在繁殖季节吸引伴侣。理解气囊的功能让我们深入了解鸟类在各种环境中生存的进化适应。它们高效的呼吸系统证明了大自然的聪明才智，使鸟类能够进行卓越的耐力和灵活性表现。总之，气囊是鸟类解剖学的重要组成部分，对于其呼吸效率、体温调节和发声至关重要。通过研究这些结构，我们对鸟类生物学的复杂性以及数百万年来进化而来的惊人适应能力有了更深刻的认识。下次当你观察一只飞鸟时，请花一点时间考虑其体内运作的复杂系统，尤其是那些使如此优雅运动成为可能的惊人气囊。