Mucous, an adjective, refers to a slippery, sticky, and viscous substance that is produced by certain glands lining the body's internal surfaces, such as the respiratory and digestive systems. The term comes from the Latin word "mucus," meaning nasal discharge.
Mucous serves as a protective and lubricating agent for the various organs it coats, aiding in their proper functioning. It provides a physical barrier against pathogens, irritants, and foreign particles, helping to prevent infections and injuries in vulnerable tissues. Additionally, it assists in the transport of substances, such as food and air, by facilitating their smooth passage along the respective tracts it covers.
The composition of mucous varies depending on its location and purpose. Generally, it consists of water, mucins (large proteins that form a gel-like consistency), electrolytes, immune cells, enzymes, and other compounds specific to each organ's needs.
A common example of mucous is the clear, slimy substance secreted by the goblet cells in the respiratory tract, responsible for trapping airborne contaminants, microorganisms, and dust particles, helping to prevent their entry into the lungs. This respiratory mucous can be expelled from the body through coughing or sneezing.
In summary, mucous refers to the slimy and sticky substance produced by glands lining internal surfaces. It plays a crucial role in protecting and lubricating organs, preventing infections, and aiding in the transport of substances within the body.
