题目内容
The _________of the lung is the midline region where blood vessels, nerves, and bronchial tubes enter and exit the organ.
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_________ are hollow, air-containing spaces within the skull that communicate with the nasal cavity.
The dome-shaped muscle under the lungs that flattens during inspiration is the_________.
The scientific name for the throat is the _________.
The trachea divides into the right and left main stem ___.
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