Closed Circulation is a Eulerian Trail

The closed circuit of a vertebrate circulation is a Eulerian trail or circuit. The circuit starts and ends at the same vertex, the heart. In a Eulerian circuit each edge is traversed only once, and blood in this optimal situation visits each component of the circuit only once. Without doing the math, if the graph is Eulerian and the circuit is a closed trail of the Eulerian type, we may solve it using Fleury's algorithm, but if the graph is non-Eulerian we also have an algorithm (Ref: Graph Theory).

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