What do saliva, tears, and nasal mucus have in common?

Question:- What do saliva, tears, and nasal mucus have in common?

Answer: From the given options, one can identify saliva, tears, and nasal mucus as different types of mucous secretions. Here, they are alike in terms of three features discussed below: First of all, they contain mucins – proteins that add viscosity, which is something between the density of an oil and liquid. Secondly, they function as ‘guardians,’ by hosting processes like agency, pathogen, material debris, and other undesirable items which might otherwise find their way into the human body. While saliva is described to increases in instances of hostile intentions towards ones mouth, tears are for the eyes and nasal mucus is for the protection of the respiratory tracts. Furthermore, secretions made by these plates can control the humidity between the eyes and also have enzymes that shield our eyes from infection. For instance while the saliva is secreted by the saliva glands, tears are secreted by tear glands, and nasal mucus by, well, nasal glands but all of them can be grouped to represent the body’s other defensive mucous barriers.