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Cartilage rings inside trachea

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Plan diagram of trachea

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Pseudostratified Columnar

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Bronchial Tissue
(ignore e bottom diagram)

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plan diagram of the trachea, bronchus and bronchiole

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plan diagram of the trachea, bronchus and bronchiole

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The gross structure of the human gas exchange system limited to the alveoli, bronchioles, bronchi, trachea and lungs.
Once air is breathed in through the mouth or nose it travels down the trachea. The trachea splits into two- one going into the left lung and one going into the right lung- these pipes are called bronchi. Each bronchus will then divide further into many bronchioles: each ending in a sac called an alveoli.

The trachea and bronchi have walls of muscle that are supported by cartilage. The cartilage is in partial rings so that the tubes can be moved in any direction. Cilia on the walls move mucus out of the breathing system and into the stomach.