Final answer:
The "C-shaped" cartilages in tracheal rings support the trachea to prevent collapse, providing an open airway for breathing, while allowing flexibility and controlled constriction for effective coughing.
Step-by-step explanation:
The significance of the "C-shaped" cartilages that reinforce the tracheal rings is to provide structural support to the trachea, ensuring it doesn't collapse and remains open for air passage. These pieces of hyaline cartilage are connected by dense connective tissue and the fibroelastic membrane, allowing for some flexibility.
This flexibility enables the trachea to stretch and expand slightly during inhalation and exhalation. Additionally, the presence of smooth muscle in the form of the trachealis muscle permits adjustments to the trachea's diameter during exhalation, which helps in the expulsion of air at a greater force, aiding in the clearance of mucus when we cough.