Throughout the evolution of species, organisms must have developed damage repair mechanisms to remain successful. Damages of various origins, from traumatic to thermal and created by Xenobiotics (external agents such as viruses, bacteria, fungi). The repair mechanism is a process where the phenomenon of inflammation is the key to the healing of a damaged tissue. Inflammation is not an increase in volume since in the common concept we say “The knee was inflamed” or “It was inflamed at the place of the blow”. The inflammation is a complex panorama of chemical reactions aimed at repairing tissues.
When there is an injury, an inflammation mechanism is awakened that calls cells of different types to work so that the tissue in question is reintegrated into its original function. For example, a skin cut will generate a biological phenomenon that leads to the expression of collagen and thus seal again this important tissue that isolates us from the outside.The repair results in a visible scar in the case of the skin, but invisible although detectable in the case of a heart muscle infarction.
Within ourselves there is the information to generate a repair and even a regeneration. The liver is a tissue that can regenerate itself, so can the bone, but not the rest of the tissues which heal and the scar is not functional, that is, the original tissue is replaced with fibrous tissue.
Biological therapies consist of using not only cells but also tissue compounds such as platelets to accelerate repair and in some cases cell regeneration, such as cartilage in orthopedics.
In biology the orders are given by the chemical compounds that react to their specific repectors and these obey by emitting the specific signal to produce collagen and other various compounds that impact the state of the cell of many tissues.