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Updated: June 2, 2025
The worst impurities in air are those that come from our own breaths and our own bodies; and, unexpectedly enough, carbon dioxid is not one of them.
"Well, I understand that both oxygen and hydrogen are furnished by natural processes, the oxygen from carbon dioxid in the carbon cycle, and the hydrogen from the water which falls in rain." "That is all true, but you really do not buy the hydrogen or oxygen. While they are included in the two-eight-two guarantee, the price is adjusted for that.
We have learned also that oxygen, taken up in the air cells of the lungs, is being continually carried to the tissues, and that the blood is purified by being deprived in the lungs of its excess of carbon dioxid.
A pouch; a membranous sac interposed between parts which are subject to movement, one on the other, to allow them to glide smoothly. Any excessive hardness of the skin caused by friction or pressure. A tube or passage. The smallest blood-vessels, so called because they are so minute. A membranous bag enclosing a part. Carbon Dioxid, often called carbonic acid.
After its work is done, and the blood returns to the right side of the heart, it is of a dark purple color. This change in color takes place in the capillaries, and is due to the fact that there the blood gives up most of its oxygen to the tissues and receives from them a great deal of carbon dioxid.
How near the surface of your back is your spinal cord? What keeps it from being easily injured? Why do our bodies need "housecleaning"? How do we get rid of the waste part that is a gas? Of the part that is water? What carries the carbon dioxid to the lungs? What carries the waste water to the sweat tubes and the kidneys? What other waste is there to be gotten rid of? 2.
The vital part of the tissues, built up from the complex classes of food, is oxidized by means of the oxygen carried by the arterial blood, and broken down into simpler bodies which at last result in urea, carbon dioxid, and water. Wherever there is life, this process of oxidation is going on, but more energetically in some tissues and organs than in others.
The quantity of oxygen removed from the air by the breathing of an adult person at rest amounts daily to about 18 cubic feet. About the same amount of carbon dioxid is expelled, and this could be represented by a piece of pure charcoal weighing 9 ounces.
The elimination of these products is brought about by a special apparatus called organs of excretion. The worn-out substances themselves are called excretions, as opposed to secretions, which are elaborated for use in the body. By the skin the body gets rid of a small portion of salts, a little carbon dioxid, and a large amount of water in the form of perspiration.
That is, expired air contains about five per cent less oxygen and five per cent more carbon dioxid than inspired air. The temperature of expired air is variable, but generally is higher than that of inspired air, it having been in contact with the warm air passages. It is also loaded with aqueous vapor, imparted to it like the heat, not in the depth of the lungs, but in the upper air passages.
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