This is a great question from one of our Twitter followers!
I think I’ll take this question, since the doctor uses a stethoscope (like me!) during your check-up to listen to your lungs as you breathe in and out.
Your lungs are the show runners of your respiratory system and come very well prepared to deal with the particles we inhale every day. You see, the inside of your lungs are coated in a thin layer of mucus. One of this gooey layer’s primary functions is to capture any foreign particles that enter your lungs.
Once the mucus has these particles in its slimey grip, it’s time for the microscopic “fingers” called cilia to get to work in pushing the dust-filled mucus up your bronchial tubes. The bronchial tubes are the airways to and from your lungs. The process then moves the mucus into your throat, where you will either cough it up or swallow it.
Here is a great diagram of your lungs so you can check out the system for yourself: