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Conceptual patterns of the relations digestionlcirculatory system and breathinglcirculatory system, found in a sample of non-university students whose ages range between 11 and 17 years old are described in this work. These patterns show that students' conceptions are relatively organized in their conceptual structure and in spite of being sometimes incomplete and wrong, they seem to be coherent for them, even making up real theories that they use to explain any problematic situation connecteddoi:10.5565/rev/ensciencias.4203 fatcat:ua6v4cvrozheplzijlgkkbkqo4