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In the respiratory system certain structures allow air to pass from the trachea to the lungs. They are lined with thin muscles and coated with epithelial cells.These structures are called O bronchial tubes.
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In the respiratory system certain structures allow air to pass from the trachea to the lungs. They are lined with thin

muscles and coated with epithelial cells.These structures are called
O bronchial tubes.
O alveoli.
O bronchioles.
O lobules.

User Kitanga Nday
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Answer:

bronchioles are the structure

User Amehta
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