The bronchi are lined with a mucous membrane. On the mucus membrane we find tiny cilia. When a person inhales, dust particles and bacteria are brought into the bronchi and caught on the cilia and the mucus membrane. The membrane secretes mucus and transports the contaminants to the pharynx so they can be either spit out or swallowed.
Asthmatic bronchi differ from normal bronchi in three ways: the muscles are cramped around them, the mucus membrane is thicker, and the inner diameter is greatly reduced.
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