Adaptation - adaptation of the animals and plants to the impacts of environmental factors. Thanks adaptation remains the optimal constant flow level of the internal processes of the organism, providing stability and its survival in the environment. Adaptation is peculiar not only to the body as a whole, and its separate organs and various excitable tissues (nerve muscle). Especially distinctly adaptation is manifested in the receptor and is expressed in the change (decrease or increase) of their sensitivity to the specific stimulus fluctuations his strength and duration of exposure (see Adaptation eyes, Adaptation hearing). Also change the sensitivity baroretseptorov arc aorta to the level of blood pressure, tactile receptors to duration tactile).
The mechanism of adaptation connected with changes in the level of biochemical processes in tissues under the influence of external factors. The intensity of these processes depends on the speed of adaptation, due to changes in the concentration of ions in tissues (CA, K, Na, C1), temperature, or the action of medicinal substances. For practical medicine, great importance is the study of the mechanisms of human adaptation to climatic conditions (see Introduction), to different working conditions, lifestyle and nutrition, as well as artificial influences therapeutic purposes (medicine, physiotherapy).