Which of the following is most abundant in the trachea and bronchi, becoming much less dense (and eventually absent) in the bronchioles?

Name: Which of the following is most abundant in the trachea and bronchi, becoming much less dense (and eventually absent) in the bronchioles?
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Question

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Cartilage is most abundant in the trachea and bronchi and becomes much less dense in the bronchioles, where it is eventually absent. This structural component provides support and maintains the airway open.

Which of the Following Is Most Abundant in the Trachea