How does a biological system normally respond a perturbation ?
Perturbation or perturb may refer to : Perturbation theory , mathematical methods that give approximate solutions to problems that can not be solved exactly Perturbation ( geology ) , changes in the nature of alluvial deposits over time Perturbation ( astronomy ) , alterations to an object 's orbit — e.g. , caused by gravitational interactions with other bodies Perturbation theory ( quantum mechanics ) , a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one Perturbation ( biology ) , an alteration of the function of a biological system , induced by external or internal mechanisms Perturbation ( transport ) , operation of a transport system outside of timetable such that delays in arrival and departure from defined locations are present .