What exactly does a person exhale from the lungs
What exactly does a person exhale from the lungs
For breathing, a person uses air contained in the atmosphere. However, its composition is significantly different from that which it exhales. In particular, the amount of oxygen and carbon dioxide varies.
Air
Ordinary atmospheric air, suitable forbreathing people and other living things, is a multicomponent mixture of gases. The bulk of its volume is made up of nitrogen, whose share reaches about 78%. The second place in this indicator is oxygen, which accounts for about 21% of the air volume. Thus, these two gases total about 99% of the air volume. The remaining 1-1.5% of the volume mostly falls on argon and carbon dioxide, as well as a small number of other gases - neon, helium, xenon and others. At the same time, the share of carbon dioxide in ordinary atmospheric air, not exposed to any impact, is usually about 0.3% by volume. Exhaled air
At the same time, the composition of the air, which is obtained inas a result of the human respiratory process, is significantly different from the original in terms of the content of a number of elements. So, it is known that in the process of breathing the human body consumes oxygen, therefore it is natural that its amount in the exhaled air is significantly less than in the inhaled air. If the original composition of air contained about 21% of oxygen, then in the air on exhalation it will be only about 15.4%. Another significant change that occurs with air in the process of breathing concerns the content of carbon dioxide. So, if in the air entering the human body, its content usually does not exceed 0.3% of the volume, then in the air leaving the body the volume of carbon dioxide reaches 4%. This is due to the fact that in the process of functioning of the human body, its organs and tissues release carbon dioxide, which is excreted in the process of breathing. But the content of other gases in the exhaled air practically does not change with respect to the original. This is due to the fact that they are inert for the human body, that is, they do not interact with it in any way - they are not absorbed and not allocated. It should be borne in mind that the air exhaled by a person, changes not only its composition, but also some physical characteristics. Its temperature approaches the temperature of the human body, which is normally 36.6 ° C. Thus, if a person inhales the cold air, his temperature will rise, and if hot, it will go down. In addition, exhaled air is usually characterized by a higher level of humidity compared to the inhaled air.
