Word: tracheas
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Dates: during 1886-1886
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...oxygen for the most part is taken in through the lungs, and the act which they perform taking it in is called respiration. At the back of the mouth are two passages leading downward, the one in front going to the lungs. The act of breathing requires that this trachea, as it is called, should be kept open all the time, so there are placed in its walls rings of cartilage which are incomplete in some part of their circumference. The epiglottis, fastened to the back part of the tongue keeps food from falling into the windpipe when...