Inthira ChaiyaChontita RattanakulSahattaya RattanamongkonkulWannapa PanitsupakamonSittipong RuktamatakulMahidol UniversityCommission on Higher EducationBurapha UniversitySilpakorn UniversityKasetsart University2018-10-192018-10-192013-11-04International Journal of Mathematics and Computers in Simulation. Vol.7, No.6 (2013), 456-465199801592-s2.0-84886716242https://repository.li.mahidol.ac.th/handle/20.500.14594/31614In this paper, we propose a system of ordinary differential equations in order to describe calcium homeostasis by considering parathyroid hormone and calcitonin as two major regulating hormones. Geometric singular perturbation is utilized in order to obtain the conditions on the system parameters that differentiate various kinds of dynamic behavior. Numerical simulations are also carried out to confirm our theoretical predictions.Mahidol UniversityComputer ScienceMathematicsArticleSCOPUS