Biological reactions

Every living organism and all its cells have irritability, ie, the ability to respond to the external environment or the violation of their States by changing its structure, appearance, strength or weakness of their activity, which is inextricably linked to qualitative and quantitative changes of metabolism and energy. Changes in the structure and functions of the body and its cells in response to different forcings are called biological reactions and impact, their cause,irritants, or incentives.
The concept of biological reactions are extremely widely. It includes all types of response of the organism, its organs and cells for different effects.
The reaction of cells are manifested in the change of their form, structure, their growth and division process, the formation of various chemical compounds, the transformation of potential energy into kinetic energy (electrical, mechanical, thermal, light), committing to a particular work (moving in space, the allocation of certain substances, osmotic work on concentration in the cell certain electrolytes).
Reactions of the entire organism, especially those challenging the acts of his behavior, are extremely varied. In the process of doing so changes the activity of many organs and countless cells, because the body always reacts to various influences as a whole, as a single complex system. Therefore, although the reaction of the organism and are due to the activity of the cells, but they can not be reduced to the reactions of individual cells. This is a General rule that the laws governing the system cannot be reduced to a separate laws forming the system elements.