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This paper advances a foundational thesis: eumelanin is the electromagnetic standard of the human body. Rather than treating eumelanin as one variable among many in human physiology, this work constructs a comprehensive systems-level map of eumelanin function across every major tissue system — skin, brain, heart, blood, and gut — documenting the electromagnetic properties of each system as they are designed to function when eumelanin is fully expressed and undisrupted. Drawing on peer-reviewed primary literature in biophysics, neuroscience, cardiology, photobiology, and biochemistry, the paper documents eumelanin as a hydration-gated mixed ionic-electronic conductor, a photon-to-electron transducer, a broadband electromagnetic absorber spanning UV through near-infrared, a charge-storage medium with supercapacitor-like behavior, a high-affinity metal chelator, and a persistent free-radical buffer. Neuromelanin in the brainstem is established as the central nervous system expression of this substrate, synthesized through the dopamine pathway — dopamine being a melanin family member. Cardiac melanocytes are established as gap-junctionally coupled to the cardiac conduction system. Biogenic magnetite is mapped in co-distribution with neuromelanin-bearing nuclei. The melanocortin system is established as a body-wide signaling network organized around melanin-axis biology. Together these findings define a human body designed for high electromagnetic sensitivity, conductivity, and coherence — and establish that architecture as the biological standard against which all other states are measured. Developed within the Neuromelanin-RAS Peptide Entrainment Framework (NRPEF).