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Over the years, the crucial importance of calcium for§many biological functions has been well established.§There are many physiological processes in which§calcium plays a significant role in a direct or§indirect manner. It has been observed experimentally§that, in many§cell types, calcium fluxes across the plasma membrane§affect inositol trisphosphate IP3-induced§calcium oscillations. Since IP3-induced calcium§oscillations involve the cycling of calcium§to and from the endoplasmic reticulum, it is not well§understood how they can be so strongly§affected by membrane fluxes. In this work, we use a§mathematical model to answer this question. Our model§predictions are confirmed by experimental results. §Although the mathematical§model refers to a particular cell type, it also§allows us to address some aspects of calcium§signalling in general. Further we study the§propagation of intercellular calcium waves in a§pancreatic acinus. The effect of inter-cellular§coupling on the oscillatory dynamics is also§investigated. It is demonstrated that junctional§calcium diffusion can account for the co-ordination§and synchronisation of cytosolic calcium oscillations§in a coupled triplet of cells.