homeostasis - the ability of the organic system to maintain the relative constancy of the dynamic equilibrium of the internal environment.This term is of Greek origin.It has a complex structure formed by two words - homoios (similar) and stasis (the state).The mechanisms of self-regulation to ensure physiological constancy, called homeostatic.Depending on the internal structure of an open system and its interaction with the environment, still support these mechanisms may have different properties:
- conditional instability of the system ensures maximum adaptability to the necessary conditions;
- The desire to preserve the balance helps to maintain the relative balance of the structure and the functional organization of the system;
- unpredictable effect allows you to methodically achieve new results contribute to continuous improvement of self-regulatory factors.
Because homeostasis - a state based on the interchange with the environment, such systems can have two types of feedback: positive and negative.Negative feedback type reflected in the reaction system, which changes the aspiration changes in the opposite direction.Feedback helps to maintain a permanent state of the system, helping to balance compliance.An example of such a connection can serve Thermoregulation in humans.Homeostasis - a complex process of interaction between all the components of each system.Increased or decreased body temperature thermoreceptors hypothalamus and skin immediately register the change.This signal is transmitted to the brain, which causes the body's response to the return - lowering or raising the temperature.
positive feedback results in an increase of the variable.Such a bond is destabilizing effect, so it does not contribute to the process.It is much less common in the functioning of organic systems, but also has its value.Homeostasis - is system requiring a combination of both types of feedback.For example, limiting the electrical potential of nerve cells is the generation of even more of the action potential.Thus, the positive feedback is required for the transition to a new state of homeostasis.Such changes are called metastable.Examples of such changes may be an increase in nutrients in the clear water of the rivers leading to the turbidity of the reaction of the reservoir and its riverbed overgrown with algae.
Homeostasis ecosystem - a dynamic balance of the ecology of nature, by means of regular renewal of its basic elements.The concept of the balance of nature has been developed by the American botanist and environmentalist Frederic Clements.Further balance distinguish biological ecosystems, cell homeostasis, and balance in the human body.This ability to be understood as a general characteristic of many processes are constantly interacting with each other.
