👉 Mucus, in the context of anatomy and physiology, refers to a type of secreted fluid that is produced by the cells lining the respiratory tract (airway) and acts as a filter between the air and the lungs. It consists primarily of mucus proteins (mucus, sputum, etc.) and contains other substances like water, electrolytes, and antibodies.
The presence of mucous in the airways helps to filter out foreign particles, such as dust or pollen, and also
mucousness