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1. en.wikipedia.org › wiki › Air_sacAir sac - Wikipedia

   en.wikipedia.org › wiki › Air_sac

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   Air sacs are spaces within birds where air is constantly present. They are involved in respiration, water loss, diving, and song production. Learn about the types, morphologies, and variations of air sacs in different bird groups.

2. www.britannica.com › science › air-sacAir sac | Respiratory System, Lungs & Alveoli | Britannica

   www.britannica.com › science › air-sac

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   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.

   • 作者: The Editors of Encyclopaedia Britannica

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4. dictionary.cambridge.org › zht › 詞典air sac中文(繁體)翻譯：劍橋詞典 - Cambridge Dictionary

   dictionary.cambridge.org › zht › 詞典

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   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

5. avesbiology.com › birdrespirationBird Respiratory System

   avesbiology.com › birdrespiration

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   Learn how birds breathe with nine air sacs that act as bellows to ventilate the lungs. Compare the avian respiratory system with that of mammals and dinosaurs, and see an animated gif and a video.

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6. en.wikipedia.org › wiki › Pulmonary_alveolusPulmonary alveolus - Wikipedia

   en.wikipedia.org › wiki › Pulmonary_alveolus

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   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 .

7. 其他人也問了

   Where are air sacs found?

   • 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. They serve to increase respiratory efficiency by providing a large surface area for gas exchange. See also pulmonary alveolus.

   Air sac | Respiratory System, Lungs & Alveoli | Britannica

   www.britannica.com/science/air-sac

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   Which air sac holds deoxygenated air first?

   • Counterintuitively, the (posterior) air sacs behind the lungs fill first, holding oxygenated air during the first stage of the respiratory cycle. The anterior air sacs hold deoxygenated air after its passage through the lungs. Anterior air sacs Posterior air sacs

   The Unique Air Sac System of Birds | Birdfact

   birdfact.com/anatomy-and-physiology/respiratory-system/air-sac-system

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   What is an air sac?

   • Accessed 20 September 2024. 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 | Respiratory System, Lungs & Alveoli | Britannica

   www.britannica.com/science/air-sac

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   How do avian air sacs work?

   • 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.

   The Unique Air Sac System of Birds | Birdfact

   birdfact.com/anatomy-and-physiology/respiratory-system/air-sac-system

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8. birdfact.com › respiratory-system › air-sac-systemThe Unique Air Sac System of Birds | Birdfact

   birdfact.com › respiratory-system › air-sac-system

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   2024年2月14日 · Learn how birds breathe with a unique system of air sacs that surround their lungs and ensure a constant supply of oxygen. Discover the anatomy, function, and adaptations of the avian respiratory system for flight, diving, and vocalization.

9. birdfact.com › anatomy-and-physiology › respiratory-systemThe Respiratory System of Birds: How Birds Breathe | Birdfact

   birdfact.com › anatomy-and-physiology › respiratory-system

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   2024年2月14日 · Learn about the unique respiratory system of birds, which uses air sacs, continuous flow, and high-efficiency gas exchange to meet their metabolic demands. Find out how birds breathe during flight, at high altitudes, and with diseases.