alleryThe trachea and bronchi stay open because they are supported by incomplete rings of:
ACartilage
BSolid bone
CSmooth muscle
DFatty tissue
Answer & Solution
Correct answer: A. Cartilage
1. The airway must not collapse.
2. C-shaped rings hold it open.
3. The rings are cartilage.
_Source: syllabus Biology, Chapter 17, Breathing and Exchange of Gases._
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