Final answer:
The respiratory system uses mucus and cilia within the nasal passages, bronchi, and bronchioles to trap and remove dust and other particulates, protecting the lungs through a process known as the mucociliary escalator.
Step-by-step explanation:
Those parts of the body that are lined with mucus and help filter dust particles are primarily found in the respiratory system. The main structures involved include the nasal passages, bronchi, and bronchioles. The mucus is a sticky substance consisting of mucin, water, and salts which traps particulates such as dust, dirt, and pathogens. Additionally, the respiratory system is equipped with cilia, which are minute hair-like projections that continuously sweep mucus laden with trapped particulates back up the throat to be swallowed and eliminated through the esophagus. This process is known as the mucociliary escalator, and it plays a crucial role in protecting the lungs and maintaining respiratory health.