It serves as support, and to keep them open.ġ5. Why do the trachea and main bronchi have cartilage? They secrete mucin, which is a precursor to mucus.ġ4. What do goblet cells in the main airways secrete? It gets bigger, as the total cross-sectional area at the alveolar level is much higher than at the trachea because there are many more alveoli, despite each individual one being much smaller than the trachea in diameter.ġ3. What happens to the total cross-sectional area of each branching level? What happens to the cross-sectional area of the individual airways as branching increases?Įach individual airway has a smaller diameter.ġ2. The volume of gas in the lungs that does not take part in gas exchange, which in a normal healthy individual is the volume of gas in the conducting airways.ġ1. Trachea and main bronchi have sticky mucus to trap any particulate matter that does get this far. How do the airways protect us from invasive foreign materials? Humidified and warmed by the walls of the airways.Ĩ. What happens to the gas you breathe in as it travels down to the alveoli? Respiratory bronchioles (NOT terminal bronchioles or anything more proximal), alveolar ducts,ħ. Where does gas exchange take place in the lungs?
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