The mucus membranes of the trachea and bronchi are lined by thread-like projections that help sweep dust and other inhaled substances away from the lower respiratory tract. These structures are known as:

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Capillaries are tiny blood vessels made of walls that are only one cell thick. Microtubules are intracellular structures from which cilia, mitotic spindles, and flagella are made. An axon is a filament extending from a neuron. It carries electrical and chemical information from the neuron cell body to neighboring cells.

The Mucus Membranes of the Trachea and Bronchi Are Lined