Abstract
In this paper, we recall the basic features of the CospanSpan(Graph) algebra for the compositional description of reconfigurable hierarchical networks. In particular, we focus on compositionality and on the possibility of describing the interactions among physical/biological systems, using a parallel with communication operation not considered in the usual Kleene's algebra. As a novel application, we give a complete compositional description in Span(Graph) of a simplified version of the heart system.