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LL of us have had experience with mucous. Some of us have thought it disgusting, while others have considered it a nuisance. We have spit it up, we have blown it out of our noses without regard to its importance. The mucous of the body, and it is found everywhere, is the lubricating agent which keeps everything running smoothly, which permits freedom of motion of various organs and is a medium of transfer of particulate material.

When we eat, the food enters the esophagus after leaving the mouth. Some of the food is not so soft and with nothing to protect the lining of the passages, the walls of the passage would be ripped away. In our mouths, however, there are large glands which excrete this substance, mucous and it hits up the nooks and crannies of the food particles as well as covering up their entire surface. The result is that there is little friction between the rough edges and the lining of the wall and so no chance tearing will take place. For double protection, the lining of the passages through which the food passes is also bathed in this substance.

It is a fact that we all breathe in particles other than pure air. Somehow the body must rid itself of these particles and the task is far too difficult and painstaking, if not impossible for us to do consciously. Thusly, the body must do it itself. Once again the lubricant is of great importance. There is a constant outpouring of the material by cells in the respiratory tract and the particles float on it. Small hairs in the respiratory tract beat this fluid and its cargo up the pharynx toward the nasal passages. The result is the continuous clearing of the respiratory tract by this amazingly clever device. But this is not all the mucous does.

When waste materials are to be excreted, care must be taken by the body that the mineral content does not rip the wall. For this reason, a terrific quantity of the cells which secrete the mucous are found in the colon.

It must be stated that the secretions in the mouth, although mucous are not completely mucous, there being an enzyme also present. This fact does not obscure the importance of the mucous.

One more type of secretion for lubrication must be mentioned and that is the secretion of the sebaceous glands. These are in the skin and have the important function of keeping the skin well oiled. Hot days often do much harm to the skin of people whose sebaceous glands, or oil glands do not work too well. They are exhorted to use artificial lubricants and with good cause. Even in cold weather we must take care this oil does not dry up. Chapped hands or burnt skins are the results. We can then see how important these agents are and hence-forth have greater appreciation of their functions.