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Air sacs are spaces within an organism where there is the constant presence of air. Among modern animals, birds possess the most air sacs (9–11), with their extinct dinosaurian relatives showing a great increase [clarification needed] in the pneumatization [1]
Air sac, any of the air-filled extensions of the breathing apparatus of many animals. Air sacs are found as tiny sacs off the larger breathing tubes (tracheae) of insects, as extensions of the lungs in birds, and as end organs in the lungs of certain other vertebrates.
air sac翻譯：氣囊（鳥類體內從肺部延伸至骨骼或其他身體部分的氣囊，用於呼吸）, （昆蟲的）氣囊, 肺泡。 了解更多。 詞典
The air sacs permit a unidirectional flow of air through the lungs. Unidirectional flow means that air moving through bird lungs is largely 'fresh' air & has a higher oxygen content. In contrast, air flow is 'bidirectional' in mammals, moving back and forth into and out of the lungs.
A pulmonary alveolus (pl.: alveoli, from Latin alveolus, "little cavity"), also known as an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. [1] Oxygen is exchanged for at the .
2024年2月14日 · Within its body, air is following a fascinating and complex path from beak to lung and back, aided by a system of structures we don’t have – the air sacs. Air flows through avian air sacs in a coordinated, one-way route, evolved to extract all the oxygen they need whether resting on a perch or speeding through the skies.
2023年6月18日 · Alveoli are tiny, balloon-shaped air sacs located at the end of the bronchioles, the branch-like tubes in the lungs. The alveoli move oxygen and carbon dioxide (CO 2) molecules into and out of your bloodstream. This article discusses the structure and function of the alveoli.
2024年2月14日 · Birds have 7-11 (usually 9) air sacs, some of which hold air before oxygen exchange, and others hold air that has left the lungs. Before oxygen is absorbed in the lungs, air flows into posterior air sacs, which collect air as it is pumped through the system. Next, air enters the parabronchi, the tubes within the lungs where oxygen exchange occurs.
2020年7月2日 · When a bird inhales, fresh air (blue) enters through the trachea and bronchus and flows into the lungs and posterior air sacs. The fresh air moving into the lungs displaces stale air (red) from the previous breath, moving it into the anterior air sacs.
此片講述二氧化碳及氧氣如何在氣囊中作交換。當中包括講解氣囊的結構及氣體擴散的原理。This video describes how carbon dioxide and oxygen diffuse across air sacs in the lungs. Air sacs structures and the...
