What is the meaning of breathing?

Consider the respiration of animals using the example of a person. We have respiratory organs – lungs. It is in them that a change in the composition of the blood occurs. The blood becomes saturated with oxygen and releases the accumulated carbon dioxide. Breathing is essential to life. All our cells require a constant supply of oxygen to carry out vital processes. First of all, this is the third stage of energy metabolism. During the life of the cell, carbon dioxide is formed. It must be removed from the cell. It is these problems that breathing together with blood circulation solves.