Thermodynamic Description of Living Homeostasis

We studied the homeostatic equilibrium of the healthy organism. The homeostasis is controlled by
oppositely effective physiologic feedback signal-pairs in various time-scales. We show that the
entropy of every signal in this state is identical and constant: SE=1.8. The controlling physiological
signals fluctuate around their average values. The fluctuation is time-fractal, (pink-noise), which
characterizes the homeostasis. The aging is the degradation of the competing pairs of signals,
decreasing the complexity of the organism. This way, the color of the noise gradually changes to
brown. A special scaling process occurs during the aging: the exponent of the frequency dependence
of the power density function grows in this process from 1 to 2, but the homeostasis of the system is
unchanged.