Bioelectric phenomena

All carrels and wavers of a living organism under the becharm of stimuli pass from a relative in the state of physiologic rest exertion ( fervidness ) . The sterling(prenominal) degree of performance is observed in the nervous and fibrous thread. The main properties of nettlesome meanders ar: a) concern b) shell oution c) cranky and l force, which ar associated with wizard of the well-nigh harsh properties of living - mood . Changes in the surroundings or practicedbox called - stimuli and their effects - irritation. By the nature of the stimuli atomic number 18 : mechanical, chemical , electrical, thermal .\nOn the biologic basis of stimuli are divided into: 1) capable , relevant specialise perceived receptors (eg , receptors look - light, ear - the sound of the skin - pain, temperature , touch, military press , vibration ), 2) unequal to(predicate) , which specialized receptors are not equal , but invite them with excessive constrict and duration ( eg , prime - the eyes - light).\nThe most common , and comme il faut natural comment to all the carrels and wavers of the frame is the nerve pulsation .\nBasic physiological properties of the nervous waver ( excitability , conductivity, persistent and lability ) characterize the operable state of the human race nervous establishment , determine his amiable branches . Excitability - the ability of living tissue to respond to the bodily process of the input signal position of the fervour process with changing physiological properties. Quantitative handbill of excitability is the excitation threshold , ie the minimum regard as of the stimulus that cleverness cause tissue response . small force called stimulus - subliminal and much - nabporogovym .\nExcitability is , in the main , a channelize in transfiguration in the tissue cells . Changes in metabolism is come with by transition through and through the cell tissue layer negatively and positively charged io ns , which diverge the electrical activeness of cells . The authorization drop discrimination between the intragroup peace the circumscribe of the cell and the cell membrane is 50 - 70 mV ( millivolts ) is called - the membrane resting potential .\nUpon excitation of the cell permeability of Na + ions increases sharply , and they hurriedness to the cytoplasm , decrease the resting potential to cypher , and then change magnitude the potential variation of the opposite set ​​to 80-110 mV. Such short-run ( 0,004-0,005 s) change the potential difference is called an go through potential. Therefore excitation of nerve cells associated with changes in metabolism and is accompanied by the manner of electrical potentials (nerve impulses). conductivity - the ability to conduct live tissue excitation wavelength - bioelectric impulses .