3D Human HeartAnatomy, valves & blood flow. 3D Kidney FunctionFull cutaway, nephron to ureter. 3D Human LiverLobes, portal triad & bile duct. The Learning Brain15 structures, how a skill sticks. 3D Human Eye15 structures, light to signal. 3D Human Lungs15 structures, breath to bloodstream. 3D Human DNA8 structures, backbone to bases. Inside a Human CellYou're viewing this model now. The Nucleus4 zoom levels, whole nucleus to a base pair. Neural Brain46 neurons, live signal traffic. Mitosis & Meiosis3D spindle, prophase to cytokinesis. Enzyme Active SiteFold a chain, dock a substrate, watch it react. Cell MembraneFluid mosaic & the Na⁺/K⁺ pump. The NephronFiltration to urine, one loop of Henle at a time. Gas ExchangeAlveolus, capillary & the O₂-hemoglobin curve. Cardiac Conduction SystemSA node to Purkinje fibres, synced to a live ECG. Protein SynthesisDNA to folded peptide, codon by codon.