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    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy
    Colored X-ray showing blood vessels in lung. — Stock Photo
    Colored X-ray showing blood vessels in lung.
    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy
    Normal human alveoli — Stock Photo
    Normal human alveoli
    Lung and bronchi structure — Stock Photo
    Lung and bronchi structure
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung
    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy
    Normal human alveoli — Stock Photo
    Normal human alveoli
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung
    Human alveoli anatomy — Stock Photo
    Human alveoli anatomy
    Respiratory system of adult — Stock Photo
    Respiratory system of adult
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung