Why do we need oxygen? Detailed answer

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Why do we need oxygen? Detailed answer

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Why do we need oxygen?

Animals can go without food for several weeks, without water for several days. But without oxygen, they die after a few minutes. Oxygen is a chemical element, and one of the most common on earth. It is all around us, making up about one-fifth of the air (and almost everything else is nitrogen). Oxygen combines with almost all other elements. In living organisms, it combines with hydrogen, carbon and other substances, making up about two-thirds of the total weight in the human body.

At normal temperatures, oxygen reacts with other elements very slowly, forming new substances called oxides. This process is called an oxidation reaction. Oxidation occurs all the time in living organisms. Food is the fuel of living cells.

When food is oxidized, energy is released that the body uses for movement and for its own growth. The slow oxidation that occurs in the organisms of living beings is often called internal respiration. A person breathes in oxygen through the lungs. From the lungs, it enters the circulatory system and is carried by it throughout the body. By breathing air, we supply the cells of our body with oxygen for their internal respiration. Thus, we need oxygen to obtain energy, thanks to which the body can function.

People with respiratory problems are often placed in oxygen chambers, where the patient breathes air, forty to sixty percent oxygen, and does not have to expend much energy to obtain the amount of oxygen he needs. Although oxygen from the air is constantly taken by living beings for respiration, its reserves, nevertheless, never run out. Plants release it in the course of their nutrition, thereby replenishing our oxygen reserves.

Author: Likum A.

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