HAIRS IN THE WINDPIPE THAT CAN NAVIGATE FAULTLESSLY

The air that is purified in the nose will proceed through the respiratory tract. The next area for the inhaled air after the nose is the windpipe. In this air, there is still foreign matter—like dust—that is harmful to one's health. Therefore, it is necessary to have the inhaled air go through another security check before it reaches the lungs. This security is ensured by the slippery layer that lines the surface of the respiratory tract. This membrane is called mucous layer. Mucous, which forms this layer, grasps tiny particles like dust that we've taken in together with the air and hinders them from entering the lungs. Yet, in addition to this, the accumulated foreign matter must also be eliminated from the body. At this point, another security mechanism comes into play. This mechanism consists of tiny hair-like structures called cilia, which lie under the mucous layer. These tiny hairs rhythmically beat upwards towards the mouth. This can be compared to ears of wheat waving in the wind all in the same direction. Thanks to this movement of the cilia, mucous, which holds the foreign matter, is carried upwards in the windpipe. Once this foreign matter is drawn up to the throat, you naturally feel the need to swallow it. So all the foreign matter that could harm your health is passed to the stomach, where it is disintegrated and destroyed by the gastric juice. The cilia placed in the windpipe do not have eyes to see, nor do they have brains to give them intellectual ability. Still they can determine the position of the pharynx, which is too far from themselves in comparison with their sizes. Besides, being aware of the possible harm of foreign matter, they do not let them enter the body. Despite years of scientific research, the mechanism of these hairs has not been fully discovered. But remember that these hairs, whose system has not been found out by human beings yet, have been working perfectly like all other components of the body since the first man was created on the face of the earth.