Title :
Mathematical treatment of the hypothalamic thermoregulatory system
Author :
El Gohary, M.I. ; Tohamy, K.H. ; Akkad, H. El ; Saleh, M.A.
Author_Institution :
Biophys. Lab., Al Azhar Univ., Cairo, Egypt
Abstract :
A system was studied that consists of a controller, namely, the hypothalamic thermoregulatory center of the brain, and a controlled system, namely, the vasomotor system in the ear of the rabbit, which is under direct control of the hypothalamus. Biological data were collected on different characteristics of this system. The data were then treated mathematically, resulting in a mathematical description of the system that accurately and quantitatively describes its behaviour. The relationship between POAH (preoptic anterior hypothalamus) and ear pinnae temperature, which was found to have a straight-line character by G.N. McEween and J.E. Heath (1973), is modified to a segmoid relation. The segmoid description is more convenient physiologically, because it gives a sort of saturation for both maximum-heating and minimum-coolness processes.<>
Keywords :
biocontrol; biothermics; brain; ear; physiological models; temperature control; POAH; biological data; brain; controlled system; controller; ear pinnae temperature; hypothalamic thermoregulatory system; mathematical treatment; maximum-heating; minimum-coolness processes; preoptic anterior hypothalamus; rabbit ear; saturation; segmoid relation; vasomotor system;
Conference_Titel :
Engineering in Medicine and Biology Society, 1988. Proceedings of the Annual International Conference of the IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-0785-2
DOI :
10.1109/IEMBS.1988.94737
