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Answer #1

The trachea is a rigid cartilagenous structure that provides the main airway connecting the upper airway to the mainstem bronchi, bronchioles and eventually alveoli of the lungs. This is the #1 most important airway to keep patent (clear & open), without that there is no breathing which means no oxygen to the blood in circulating to the tissues and eventual failure. This is the first component checked in a CPR rescue.

Answer #2

is lined with mucous membranes and cilia to trap dust, bacteria, and pollen

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