Q: What provides support to trachea, bronchi, and bronchioles?  

Answer: A

The trachea, bronchi, and bronchioles are all supported by incomplete cartilaginous rings. These rings are made of hyaline cartilage, which is strong enough to hold the structures in place while also allowing some flexibility for movement during breathing. The rings are not complete, meaning that there is a gap in the back where the trachea and bronchi meet the esophagus and blood vessels. This allows for the structures to expand and contract as needed during breathing. Additionally, a small smooth muscle at the end of the trachea also provides support.

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