How does mucus and cilia keep the lungs free of bacteria and dust particles?
Mucus is produced by the goblet cells, in the airways dust particles etc will stick to the mucus, cilia cells then use energy to sweep the mucus up back up through the trachea, where we can swallow it and dust particles and pathogens etc can be broken down by enzymes in the stomach, or we can expell it by sneezing or coughing Good luck on the test
