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

fYear

1988

fDate

4-7 Nov. 1988

Firstpage

591

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/IEMBS.1988.94737

Filename

94737