Fluid dynamics is obvious, as blood a fluid medium flows within a restraint, the blood vessel. But blood contains salts, so it is charged and acts as current passing through a wire. Thus hemodynamics may be studied as an electrical current. At sub-cellular levels the structure of the molecule defines the possible functions of the molecule and a specific molecular function requires a specific molecular structure . At the tissue-organismal level we see the structural arrangement of tissues will determine the possible functions and specific tissue function requires that the tissue have a certain structural arrangement .
Adaptations occur slowly through evolution and are irreversible .
This is a physiological change within an individual organism due to chronic exposure to a new naturally occurring environment change. Such as the change in respiration of organisms when they migrate from a valley to higher elevation in summer and vice versa in winter. This process is reversible and necessarily occurs fairly rapid . If the physiologic change in an organism is induced in an experimental condition, the process is then called acclimation . Many physiological activities are directly involved with the process of maintaining homeostasis .