| 11. | The anthers are a green-yellow in colour and they lack an air sac.
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| 12. | Veterinarians are planning an MRI to determine the air sac's condition.
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| 13. | The "'alveoli "'are tiny air sacs in the lungs where gas exchange takes place.
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| 14. | This is filled with air sacs and fat that aid in buoyancy and biosonar.
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| 15. | These bronchioles give rise to the air sacs in the lungs called the alveoli.
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| 16. | They have facial air sacs under their skin which cushion the impact with the water.
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| 17. | Blood and fluid leak into the spaces between the lung's tiny air sacs, impairing function.
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| 18. | State-of-the art ventilators inflate air sacs in their lungs.
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| 19. | They have long air sac that serve as lungs that extends from the gill chamber.
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| 20. | Respiratory air sacs often form air pockets within the semi-hollow bones of the bird's skeleton.
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