The word exogenous ( ancient Greek ἔξω exo "(from) outside", ancient Greek γένος génos "origin") means that something arises from external causes or from the exterior of a system works out in or out. The opposite is endogenous . These words are used in various sciences .
The word is made up of the Greek word components exo ( Greek ἔξω ) for “to”, “from”, “outside”, “outside” and the suffix -gen . Exogenous therefore means that something lies outside or has arisen through external causes. If the term in the natural sciences and the medicine used, it refers generally to outside the organism arising , penetrating from the outside into the organism , arising from external causes , interacting from outside the body . This can describe substances, substances, bacteria, viruses or processes, for example. The word exogenous is also used in a variety of other specialist areas .
Use in various sciences
- In the archeology of the Stone Ages , the raw material from which stone artifacts have been produced, called exogenous, if it does not occur at the point of reference.
- In botany , exogenous plant parts are those parts of a plant that arise from layers of tissue on the surface of the plant, and not inside the plant.
- In geology , exogenous processes are those that occur on the earth's surface caused by external forces such as gravitation, wind and solar radiation, such as erosion .
- In medicine , exogenous causes of diseases are, for example, pathogens or substances that penetrate the organism from outside .
- In politics, there are exogenous and endogenous causes of poverty : exogenous causes are external factors; endogenous are factors that lie within the country.
- In psychiatry , one speaks of exogenous factors when the causes of psychoses are, for example, poisons or other external influences.
- The psychology speaks of exogenous factors or processes if they arise from external causes and effects out and plant conditions nor are inherited.
- In statistics , exogenous variables refer to factors, from the expression of which in a causal or structural equation model the expression of an endogenous variable should be explained or predicted.
- In economics , quantities are called exogenous if they represent an independent variable in a model . Exogenous variables are therefore those variables of a model that can be freely selected and changed, i.e. with which the endogenous variables of a model can be influenced. On a national economy is impacting shocks usually have exogenous causes in other countries .