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Sac | definition of sac by Medical dictionary
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Bronchioles and alveoli in the lungs - Mayo Clinic
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Air flow through alveolar sacs of the lungs - Stock Video Clip - K003/5489 - Science Photo Library
Diagram showing the healthy trachea and air sacs of the human lungs. use in medicine and education Stock Illustration | Adobe Stock
Air sacs hi-res stock photography and images - Alamy
