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Adaptation (Latin adaptatio – adaptation) – process of adaptation of an organism, population or other biological system to the changing living conditions (functioning). Adaptations of the person are the cornerstone the morpho-physiological changes developed in the course of his evolutionary development which are directed to preservation of relative constancy of its internal environment – a homeostasis.


  • Adaptation painful – adaptation of receptors and vocational central educations to action of the damaging irritants that leads to elimination or weakening of pain;
  • Adaptation flavoring – adaptation of the flavoring analyzer that leads to weakening of flavoring feelings;
  • Adaptation to height – adaptation of the person to living conditions and vigorous activity with the lowered partial pressure of oxygen in the inhaled air (as a rule, when climbing mountains and stay in unpackaged cabins of aircraft);
  • Visual adaptation – adaptation of the visual analyzer to the level of brightness of color (light) irritants that causes changes of color (light) sensitivity;
  • Adaptation of nerve centers – adaptation which is shown decrease in excitability of nerve centers at long influence of any irritants;
  • Adaptation mental – adaptation of mental activity of the person to requirements and conditions of the environment;
  • Adaptation of receptors – adaptation which is shown by decrease in sensitivity of receptors to constant action of irritants;
  • Light adaptation – visual adaptation to increase in brightness of light. It is shown by decrease in light sensitivity of eyes;
  • Sensory adaptation (synonym: adaptation sensitive) – adaptation of the analyzer which is shown by decrease in intensity of feeling at long influence of the corresponding irritant;
  • Adaptation acoustical – adaptation of the acoustic analyzer to influence of an intensive sound. It is shown by decrease in acoustical sensitivity in time or after action of a sound;
  • Adaptation tactile – adaptation of tangoreceptors to actions of irritants which is shown decrease in their sensitivity;
  • Adaptation dark – visual adaptation to darkness. It is shown by increase in light sensitivity of eyes;
  • Adaptation temperature – adaptation of thermoreceptors to influence of constant temperature. It is shown by decrease in their sensitivity;
  • Adaptation to toxic substance – organism adaptation to intake of toxic substances from the environment. It is expressed by the fact that initial reaction to these substances forever and completely disappears, further it is not found by means of modern methods of a research;
  • Adaptation labor (synonym: adaptation professional) – adaptation of the person to a certain form of work (conditions of the production environment and the nature of work) that, as a rule, leads to increase in professional working capacity;
  • Adaptation physical – organism adaptation to the changing exercise stresses;
  • Adaptation color – visual adaptation to color irritants. It is shown by decrease in color sensitivity of eyes and disturbance of distinguishing of color tones;
  • Adaptation evolutionary – population adaptation to the systematic unidirectional unsharp changes of conditions of the environment. Occurs among generations selection of more adapted genotypes;
  • Adaptation euzymatic – increase in activity of a certain enzyme in cells under the influence of the specific extracellular substances which are usually substrate of the induced enzyme.
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During life the average person develops neither more nor less two big pools of saliva.