Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

Which structures ensure that the trachea is kept open?

1. Connective tissues

2. Cartilaginous rings

3. Muscle fibers

4. Nerve endings

The correct answer is: Cartilaginous rings

The trachea, or windpipe, is a crucial part of the respiratory system, functioning as a passage for air to travel to and from the lungs. Its structure is particularly designed to maintain openness and prevent collapse, which is essential for effective breathing. The correct answer, cartilaginous rings, refers to the C-shaped rings of hyaline cartilage that encircle the trachea. These rings provide structural support, keeping the trachea open and ensuring that it maintains its shape regardless of changes in pressure during breathing. The design of these rings allows for flexibility while preventing the trachea from collapsing during inhalation, which is vital for maintaining a clear airway. While connective tissues play a role in the overall structure of the trachea, they do not specifically ensure the trachea remains open as the cartilaginous rings do. Muscle fibers are indeed present in the trachea, but they primarily serve functions related to contraction and relaxation rather than providing structural support to keep it open. Nerve endings are involved in sensing but do not contribute to maintaining the structural integrity of the trachea.