As we breathe, sometimes small particles of bacteria may make it deep down the respiratory tract, landing on the walls of the trachea and bronchial tubes. Special cells and glands, in the membranes that line these walls secrete a slightly sticky fluid, mucus, which trap and hold dirt, debris, and microorganisms. That way, our lungs stay clear and clean!
AMAZING ISN’T IT?
20/20 VISION — SEEING YOUR POSSIBILITIES!
