The HPA system is a complex neuroendocrine system whose main purpose is to regulate wide variety of bodily processes, under basal physiological conditions and during stress, by regulating the plasma levels of corticosteroids secreted from adrenal glands. In this paper, we apply the singularity theory approach to an initial model of this system, which we have previously published.Physical chemistry 2006 : 8th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-29 September 200
