Mucus streaming is defined as?

Mucus streaming refers to the process where mucus, along with trapped particles such as dust, allergens, and pathogens, is propelled upward through the respiratory tract. This movement helps clear the airway by transporting these particles past the epiglottis and into the throat area, where they can be swallowed or expectorated. This function is crucial for maintaining clear air passages and protecting against respiratory infections.

The other options do describe some aspects of mucus production or related symptoms but do not accurately capture the mechanism and function of mucus streaming. For example, while watery discharge after breathing in an allergen is a symptom that might occur as a result of increased mucus production due to irritation, it does not specifically define mucus streaming. Similarly, postnasal drip is a condition that can arise from mucus accumulation but is not what defines the action of mucus streaming itself. What makes your nose run reflects the result of mucosal irritation or increased secretion but does not describe the action of propelling mucus.