Final answer:
Sneezing is an involuntary response that helps clear the nasal and oral airway of foreign particles. It expels tiny droplets of mucus and debris from the mouth, which can contain respiratory pathogens. The respiratory system's cilia and coughing mechanism further aid in removing mucus and trapped particles from the respiratory tract.
Step-by-step explanation:
Sneezing is an involuntary response that helps clear the nasal and oral airway of foreign particles. When the nerves lining the nasal passage are irritated, it triggers a forceful expulsion of air from the mouth, expelling millions of tiny droplets of mucus and other debris into the air. This is why it is important to cover your mouth with a sleeve to prevent the transmission of respiratory pathogens.
Sneezing can expel many pathogens from the respiratory tract, which is why it is vital to cover your mouth and nose when sneezing. The particles that move up the mucociliary escalator to the throat are generally removed from the respiratory tract by clearing the throat or coughing. Coughing is another involuntary response of the respiratory system that helps remove mucus and debris from the upper respiratory tract.
In the respiratory system, cilia play a crucial role in trapping and removing dust, germs, and other foreign particles. They line most of the airways and move in a wave-like motion that sweeps mucus and particles upward toward the throat, where they can be expelled from the body. Nasal breathing is considered superior to mouth breathing as the hair-lined nasal passages filter particles more efficiently and moisturize the air, making it advantageous, especially in colder and drier conditions.