Multiple choice

Which of the following prevents collapsing of trachea?

  1. Muscles

  2. Diaphragm

  3. Ribs

  4. Cartilaginous rings

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D Correct answer
Explanation

The trachea is prevented from collapsing by C-shaped cartilaginous rings made of hyaline cartilage. These rings provide structural support while allowing flexibility for esophagus expansion behind the trachea (the open part of C faces posteriorly). Muscles and diaphragm are involved in breathing mechanics but don't support the trachea structure itself. Ribs protect the lungs but not the trachea.

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