It's not like your heart cells and kidney cells get all mixed up every day, and that's because there's all of this chemistry going on, these molecules that say who each of these groups of cells is and what their tasks should be.
As células do corazón e as dos riles nunca se mesturan, grazas a todos estes procesos químicos, a estas moléculas que din que células son de cada grupo, e que tarefas debe realizar cada un.