In recent years, "solvated electrons" were shown to be emitted by various biological systems in humans such as hormones, enzymes, amino acids, etc., even by vitamins, dyes, and other organic compounds. Based on experimental results and data from the literature, it is hypothesized that most biological systems in humans are capable of emission. Most systems in humans generate as well as consume and transfer them to other moieties, hence enabling intersystem communication via the brain. Emission of is associated with generation of free radicals, which are likewise involved in biological processes in humans. The data presented in this article underline this hypothesis, which offers a completely new concept in the course of biological mechanisms in humans.