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NECESSITY OF BREATHING
If all the carbon dioxide were emptied at each breath, one might surmise that breathing would not be the smooth procedure which it ordinarily is. And certainly with this system the body does not have to live a hand-to-mouth (that is, improvident) existence as regards oxygen. A person can comfortably talk, laugh, or do many other things causing a cessation of breathing for a while with no discomfort. All my life I have enjoyed swimming under water and until very recently the snorkel has not been in existence. But long ago I learned a little trick which made it easy for me to take my time looking over the beauties of a sandy or pebbly bottom. Before plunging, I took a series of deep breaths. This did two things for me: it cleared out a lot of carbon dioxide, and at the same time gave me an extra supply of oxygen.
It has taken a long while to describe the course of this air from the atmosphere to the innermost recesses of the lungs. When it finally arrives, it is in a multitude of little chambers. In the wall of each are small blood vessels called capillaries, so fine that they barely allow blood corpuscles to squeeze through. These corpuscles or red blood cells are composed mostly of hemoglobin, an iron compound which carries oxygen from the lungs to the tissues and brings back the carbon dioxide. Just as the apparatus which carries the air in and out of the lungs never completely empties itself, so the hemoglobin never empties itself of oxygen or carbon dioxide. The body always works along at a gait much slower than it is capable of going. With extreme exertion the muscles sometimes use up oxygen many times faster than what we may consider normal. Then the blood is ready with the necessary reserves.
So far the talk has been about the two main gases handled by the lungs. There are many others which are also easily transported by the blood. Those which produce anesthesia are most conveniently introduced into the body by this route and are also so quickly eliminated that they are as a rule safer than those given in liquid form. At the opposite extreme is hydrocyanic gas, which when inhaled produces almost immediate death. Other materials are excreted by the lungs as your nose has at times told you.
Thus the lungs form an excretory organ, helping out the kidneys and the skin. They can in this way get rid of as much as a quart of water a day. Once again we have an example of a bodily organ, while performing one function, helps out in another. The whole interior surface of the respiratory tract has to be kept wet. Over and over you are reminded that all the functions of the body are performed only in a fluid medium. It has been said that the lungs absorb oxygen from the air. They do this through the moisture on the inner surface of the little chambers where the exchange takes place. It is just as necessary for the lungs to be kept moist as it is for the gills of a fish.
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